Depth contours, shoreline configurations, and interactions with other currents influence a current's direction and strength. The oceanographers used the they’d gathered from studying the ducks to confirm their predictions about the paths of major ocean currents. Disadvantage: The areas where a warm and cold current meet also experience foggy weather making it difficult for navigation. You are very important to us. It reached 288 million tonnes in 2012, an increase of 620% over 1975. 1 Answer. Generally, the warm ocean currents originate near the equator and move towards the poles. The ocean currents carry cold water from the polar regions to equatorial regions. This determines the agricultural and hence all other economic activities of the region. Water covers more than two-thirds of the Earth’s surface. Horizontal movements are referred to as currents, while vertical changes are called upwellings or downwellings. Ocean currents have the following effects: I. They bring about warm temperatures over land surfaces, for example, the Gulf stream. [5] The Ekman spiral velocity distribution results in the currents flowing at an angle to the driving winds, and they develop typical clockwise spirals in the northern hemisphere and counter-clockwise rotation in the southern hemisphere. Generally, the warm ocean currents originate near the equator and move towards the poles. Ocean currents are streams of water flowing constantly on the ocean surface in definite directions. These waters make up the other 90% of the ocean. Ocean currents are streams of water flowing constantly on the ocean’s surface in definite directions. The ocean 2. They are important ocean vegetation that most marine creatures need in their diet. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students. Ocean Current. Winds blowing over a warm current become warm and at the same time, pick … [6] Answer: The rhythmic rise and fall of ocean twice in a day is called a tide. To know more about water, its distribution, ocean circulation, tides, waves, ocean currents go through CBSE Class 7 Geography notes of Chapter 5 -Water. Answer: They are the streams of water flowing constantly on the ocean surface in definite directions. 7. The cold currents carry water from polar or higher latitudes to tropical or lower latitudes. (i) Ocean water is salty. Some currents flow for short distances; others cross entire ocean basins and even circle the globe. An ocean is a huge body of salt water . This abiotic system is responsible for the … Answer the following questions briefly. The ocean currents may be warm or cold. On occasion, it is imprecisely used to refer to the meridional overturning circulation, MOC. The ocean current The ocean currents may be warm or cold. Ans. Winds, water density, and tides all drive ocean currents. Answered by | 24th Apr, 2015, 09:51: AM Currents in the pacific ocean There are two Equatorial currents in the Pacific Ocean. Ocean currents are important in the study of marine debris, and vice versa. What are Ocean currents? They are classified as warm currents and cold currents. Download Class 7 SST Geography Chapter 5 MCQ in PDF format from the below access links and start practicing on a regular basis for better subject knowledge. NCERT Solutions for Class 7 Social Studies Geography 3. Ocean Currents - Ocean currents are streams of water flowing constantly on the ocean surface in definite directions. For any content/service related issues please contact on this number . Ocean currents are primarily horizontal water movements. Ocean currents are like giant conveyor belts flowing through the oceans moving huge amounts of water all the time. Warm currents bring warm water into cold water areas and are usually observed on the east coasts of continents in the low and middle latitudes. In the wind powered sailing-ship era, knowledge of wind patterns and ocean currents was even more essential. He major sources of fresh water in … (b) What is water cycle? Ocean currents are formed because of the temperature differences between the ocean water present at different latitudes. Ocean Currents act as major ocean routes which are followed by the navigating ships. Cold ocean water currents flowing from polar and sub-polar regions bring in a lot of plankton that are crucial to the continued survival of several key sea creature species in marine ecosystems. They contain almost 98 percent of all the water on Earth . 2. Ocean Currents - Ocean currents are streams of water flowing constantly on the ocean surface in definite directions. Ocean currents are streams of water flowing constantly on the ocean surface in definite directions. Knowledge of surface ocean currents is essential in reducing costs of shipping, since traveling with them reduces fuel costs. Oceans Currents: The movement of oceanic water on the surface and at the depths in a definite direction is called ocean current. Tick the correct answer. The Sōryū-class submarines (16SS) are diesel-electric attack submarines.The first boat in the class entered service with the Japan Maritime Self-Defense Force in 2009. (i) The process by which water continually changes its form and circulates between oceans, atmosphere and land (a) Water cycle (b) Tides (c) Ocean currents Answer: a (ii) Generally, the warm ocean currents originate near (a) Poles (b) Equator (c) None of these We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. 9372462318 / 9987178554. Some ocean currents flow at the surface; others flow deep within water. Some ocean currents flow at the surface; others flow deep within water. They may be warm or cold. The Labrador Ocean current is cold current while the Gulf Stream is a warm current. Social Science. Class 7 Social Science – Geography Chapter 5 – Important Questions From cold to hot (and vice versa), oceans transport water. These notes comprise all the concepts covered in the chapter in a well-structured manner. NSO & IMO Class 8. An ocean current flows for great distances and together they create the global conveyor belt, which plays a dominant role in determining the climate of many of Earth’s regions. Ocean water moves in two directions: horizontally and vertically. Since its commercial development in the 1950s, plastic has been a real success. The story of the ducks was also used to raise awareness about the dangers of dumping in the ocean. Class 7. They bring warm temperature over land surface. Directional mass flow of oceanic water generated by external or internal forces. The ocean currents may be warm or cold (Fig. Deep ocean currents are driven by density and temperature gradients. 0 votes . Generally, the warm ocean currents originate near the equator and move towards the poles. Deep Water Currents--Thermohaline Circulation. Thus, the wind that reaches the land brings down the temperature and causes heavy rainfall. For example, the ocean current that brings warm water up the north Atlantic to northwest Europe also cumulatively and slowly blocks ice from forming along the seashores, which would also block ships from entering and exiting inland waterways and seaports, hence ocean currents play a decisive role in influencing the climates of regions through which they flow. Names, direction, nature....and what not! class-7; Share It On Facebook Twitter Email. MCQ Questions for Class 7 Social Science with Answers were prepared based on the latest exam pattern. An example is the life-cycle of the European Eel. The warm ocean currents originate near the equator and move towards the poles. Where does the word tsunami come from and what does it mean? They move in a circular pattern around the oceans. Q6: What are ocean currents? This can be sea creatures or ships, but unfortunately can also be rubbish that has been dumped carelessly by people. Warm Currents: Cold Currents: 1. Another example is Lima, Peru, where the climate is cooler, being sub-tropical, than the tropical latitudes in which the area is located, due to the effect of the Humboldt Current. [10] Extensive mixing therefore takes place between the ocean basins, reducing differences between them and making the Earth's oceans a global system. Ocean currents are the regular movements of water in the oceans. The streams of water flowing constantly on the ocean surface in a definite direction are called ocean currents. The continuous flow of seawater from one direction to another is called ocean tides, It is caused due to by forces acting upon this mean flow, such as breaking waves, wind, the Coriolis effect, cabbeling, temperature and salinity differences. Others (16-25) Here are some more functions of ocean currents. Question 1. The Ocean is the heart of the planet. Most of the rocks present in the earth convect on a large scale. 1. A lot of fuel and time are saved if ships move along the direction of currents. Warm Current: They originate near the equator and move towards the poles. 7th Class. By moving heat from the equator toward the poles, ocean currents play an important role in controlling the climate. Deep ocean currents are currently[when?] Surface oceanic currents are driven by wind currents, the large scale prevailing winds drive major persistent ocean currents, and seasonal or occasional winds drive currents of similar persistence to the winds that drive them,[4] and the Coriolis effect plays a major role in their development. Filed Under: CBSE Class 7. Surface Currents: They constitute about 10% of all the waters in an ocean.These waters are occupied at the upper 400m of an ocean or the Ekman Layer.It is the layer of the ocean water which moves due to the stress of blowing the wind and this motion is thus called as Ekman Transport. In our geography notes on the hydrosphere, we have seen the major movements of the ocean water. Warm currents keep the ports in the polar region operational because it makes an ice-free throughout the year. Generally the warm ocean currents originate near. Well, you might have heard so many names like Kuroshio current, Oyashio current, Peru current … (a) What is precipitation? 17/05/2020 10:41 pm. The thermohaline circulation is sometimes called the ocean conveyor belt, the great ocean conveyor, or the global conveyor belt. Winds blowing over a warm current become warm and at the same time, pick up moisture, as warm winds are able to retain more moisture. The ocean currents may be warm or cold. What are ocean curr... Notifications Clear all What are ocean currents? A high tide occurs when ocean water covers much of the shore by rising to its highest level. Ocean dynamics define and describe the motion of water within the oceans. This dense water then flows into the ocean basins. 3. Asked by swastik191207 | 28th Dec, 2020, 09:18: PM. Warm currents keep the ports in the polar region operational because it … Winds blowing over warm currents are moist and bring rainfall to the coastal region while wind blowing over cold current are dry and cool thus hardly vary any moisture. (vi) Ocean currents are streams of water flowing constantly on the ocean surface in definite directions. Ocean currents affect the coastal region. Ocean Tides The continuous flow of seawater from one direction to another is called ocean tides, It is caused due to by forces acting upon this mean flow, such as breaking waves, wind, the Coriolis effect, cabbeling, temperature and salinity differences. What are the major sources or fresh water in the world ? Ocean currents are streams of water flowing constantly on the ocean surface in definite directions. Having covered the fundamentals, we shall see in this post, a super-fast way to learn the details of ocean currents. Tick the correct answer. The warm ocean currents originate near the equator and move towards the poles. The major ocean currents roughly follow a common set of circular paths. While the bulk of it upwells in the Southern Ocean, the oldest waters (with a transit time of around 1000 years)[9] upwell in the North Pacific. The success of plastic comes from its remarkable qualities: ease of shaping, low cost, rot-resistance, mechanical resistance… It is the ideal material for packaging, which is its main sector of use (40 to 50%, accor… What are ocean currents? As such, the state of the circulation has a large impact on the climate of the Earth. Disadvantage: The areas where a warm and cold current meet also experience foggy weather making it difficult for navigation. Since plankton are the food of fish, abundant fish populations often live where these currents prevail. Earth’s rotation results in the Coriolis effect which also influences ocean currents. Ocean currents are the continuous, predictable, directional movement of seawater driven by gravity, wind (Coriolis Effect), and water density. They are caused by differences in the temperature and salinity of water, by wind, solar heating and gravity. [7][8] The adjective thermohaline derives from thermo- referring to temperature and -haline referring to salt content, factors which together determine the density of sea water. They influence the temperature conditions of the area. Ocean Currents act as major ocean routes which are followed by the navigating ships. In addition, the areas of surface ocean currents move somewhat with the seasons; this is most notable in equatorial currents. The cold currents carry water from polar or higher latitudes to tropical or lower latitudes. carry water from polar or higher latitudes to tropical or lower latitudes. Surface currents refer to movement of the top layer of ocean water – the upper 330 feet or so – primarily driven by wind. Ocean currents are formed because of the temperature differences between the ocean water present at different latitudes. 2. When sea water moves continuously in a particular direction a current is formed. The cold currents carry water from polar or higher latitudes to tropical or lower latitudes. The further one travels from the Equator, the colder the ocean water generally becomes. Ocean Tides. Due to convection, the warm currents that originate near the Equator move towards the Poles. Ocean currents are streams of water flowing constantly on the ocean surface in definite directions. What are ocean currents? 1. The global ocean conveyor belt is a constantly moving system of deep-ocean circulation driven by temperature and salinity; Learn how and when to remove this template message, Atlantic meridional overturning circulation, Latitude of the Gulf Stream and the Gulf Stream north wall index, "Massive Southern Ocean current discovered", "Strong export of Antarctic Bottom Water east of the Kerguelen plateau", National Oceanic and Atmospheric Administration, "The concept of the thermohaline circulation", "Characterizing transport between the surface mixed layer and the ocean interior with a forward and adjoint global ocean transport model", "A slowing cog in the North Atlantic ocean's climate machine", "Thermohaline circulation: The current climate", Current global map of sea surface currents, Deep-ocean Assessment and Reporting of Tsunamis, North West Shelf Operational Oceanographic System, Jason-2 (Ocean Surface Topography Mission), Cleaning and disinfection of personal diving equipment, Swimming at the 1900 Summer Olympics – Men's underwater swimming, Confédération Mondiale des Activités Subaquatiques, Fédération Française d'Études et de Sports Sous-Marins, Federación Española de Actividades Subacuáticas, International Association for Handicapped Divers, Environmental impact of recreational diving, Table Mountain National Park Marine Protected Area, Finger Lakes Underwater Preserve Association, Maritime Heritage Trail – Battle of Saipan, Use of breathing equipment in an underwater environment, Failure of diving equipment other than breathing apparatus, Testing and inspection of diving cylinders, Association of Diving Contractors International, Hazardous Materials Identification System, International Marine Contractors Association, List of signs and symptoms of diving disorders, European Underwater and Baromedical Society, National Board of Diving and Hyperbaric Medical Technology, Naval Submarine Medical Research Laboratory, Royal Australian Navy School of Underwater Medicine, South Pacific Underwater Medicine Society, Southern African Underwater and Hyperbaric Medical Association, United States Navy Experimental Diving Unit, List of legislation regulating underwater diving, UNESCO Convention on the Protection of the Underwater Cultural Heritage, History of decompression research and development, Basic Cave Diving: A Blueprint for Survival, Bennett and Elliott's physiology and medicine of diving, Code of Practice for Scientific Diving (UNESCO), IMCA Code of Practice for Offshore Diving, ISO 24801 Recreational diving services — Requirements for the training of recreational scuba divers, The Silent World: A Story of Undersea Discovery and Adventure, List of Divers Alert Network publications, International Diving Regulators and Certifiers Forum, List of diver certification organizations, World Recreational Scuba Training Council, Commercial diver registration in South Africa, American Canadian Underwater Certifications, Association nationale des moniteurs de plongée, International Association of Nitrox and Technical Divers, International Diving Educators Association, National Association of Underwater Instructors, Professional Association of Diving Instructors, Professional Diving Instructors Corporation, National Speleological Society#Cave Diving Group, South African Underwater Sports Federation, 14th CMAS Underwater Photography World Championship, Physiological response to water immersion, Russian deep submergence rescue vehicle AS-28, Submarine Rescue Diving Recompression System, Artificial Reef Society of British Columbia, Diving Equipment and Marketing Association, Society for Underwater Historical Research, Underwater Archaeology Branch, Naval History & Heritage Command, International Submarine Escape and Rescue Liaison Office, Submarine Escape and Rescue system (Royal Swedish Navy), Submarine Escape Training Facility (Australia), Neutral buoyancy simulation as a training aid, https://en.wikipedia.org/w/index.php?title=Ocean_current&oldid=1023558023, Short description is different from Wikidata, Articles needing additional references from January 2014, All articles needing additional references, All articles with vague or ambiguous time, Vague or ambiguous time from December 2020, Srpskohrvatski / српскохрватски, Creative Commons Attribution-ShareAlike License, Hazard identification and risk assessment, This page was last edited on 17 May 2021, at 01:22. The ocean currents may be warm or cold. What are ocean currents discussed in Chapter 5 of NCERT Solutions for Class 7 Geography? (vi)Ocean currents are streams of water flowing constantly on the ocean surface in definite directions. By practicing Class 7 Geography Chapter 5 MCQ with Answers, you can score well in the exam. The cold currents carry water from polar or higher latitudes to tropical or lower latitudes. | EduRev Class 7 Question is disucussed on EduRev Study Group by 137 Class 7 Students. Surface currents, which make up only 8% of all water in the ocean, are generally restricted to the upper 400 m (1,300 ft) of ocean water, and are separated from lower regions by varying temperatures and salinity which affect the density of the water, which in turn, defines each oceanic region. Ocean currents are similar to winds in the atmosphere in that they transfer Q19. They are - waves, tides and ocean currents. Ocean currents are also critically important to sea life. Its world production follows an exponential. The winds blowing over warm currents are moisture-laden … These waters move around the ocean basins by density driven forces and gravity. Ocean currents are also very important in the dispersal of many life forms. The circulation of water between ocean and land is know as the ___, The rhythmic rise and fall of ocean water twice a day is called. Sea plants, like Posidonia, produce 70% of the oxygen we breathe (1), and the deep waters are home to wildlife and some of the biggest creatures on earth.It provides us with food, jobs, life, entertainment, and sailing! Ocean currents are formed because of the temperature differences between the ocean water present at different latitudes. An ocean current is a continuous, directed movement of sea water generated by a number of forces acting upon the water, including wind, the Coriolis effect, breaking waves, cabbeling, and temperature and salinity differences. The ocean currents also help move anything that floats in them. Ocean currents are the continuous, predictable, directional movement of seawater driven by gravity, wind (Coriolis Effect), and water density. They bring about warm temperatures over land surfaces, for example Gulf stream. The thermohaline circulation is a part of the large-scale ocean circulation that is driven by global density gradients created by surface heat and freshwater fluxes. Best answer. Generally, the warm ocean currents originate near the equator and move towards the poles. The ocean currents help in bringing the plankton to where they are also needed. The design is an evolution of the Oyashio-class submarine, from which it can most easily be distinguished by its X-shaped stern combination diving planes and rudders.The Sōryūs have the largest … Check the below NCERT MCQ Questions for Class 7 Geography Chapter 5 Water with Answers Pdf free download. Why is ocean water not suitable for domestic use? Oceans cover nearly 71 percent of Earth’s surface. Ocean currents are patterns of water movement that influence climate zones and weather patterns around the world. 5.6). They are streams of water flowing continuously on the ocean’s surface in definite directions. These currents also affect temperatures throughout the world. Ocean water moves in two directions: horizontally and vertically. Currents influence the climate of the costal regions. [1] Depth contours, shoreline configurations, and interactions with other currents influence a current's direction and strength. Answer: Ocean currents are streams of water flowing constantly on the ocean surface in definite directions. NTSE Foundation ... ocean currents will occur and the very low and very high temperatures will force the living beings on the earth to move away from the equator and poles. (e) What are tides and how are they […] Geography. 7. In the Northern Hemisphere they are found in west coasts of continents in high latitudes. An ocean current is a continuous, directed movement of sea water generated by a number of forces acting upon the water, including wind, the Coriolis effect, breaking waves, cabbeling, and temperature and salinity differences.