Question

B. Give reasons.
1.Oceans in the tropics have very high salinity.
2. Ocean water is constantly moving.
3.When warm and cold currents meet, visibility is reduced.
4. Ocean water is warmest near the Equator.
5. Tsunami causes damage to coastal agricultural land, flora and fauna.
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Answer 1

Answer:

1. Here the sky is usually clear and the oceans are exposed to the onshore trade winds. As a result of these factors, evaporation is very high near the tropics. This causes concentration of salts. For this reason, areas of the highest salinity are seen near the tropics (about 38 gm per kg).
2. Ocean water is constantly moving, and not only in the form of waves and tides. Ocean currents flow like vast rivers, sweeping along predictable paths. Some ocean currents flow at the surface; others flow deep within water.
3. A warm current may have moist air along with it. This moist air condenses when it comes in contact with the cold air travelling along with the cold current. This condensation is fog which reduces the visibility.
4. The ocean receives most of its heat along the equator, where incoming solar radiation is about double that received at the poles. Hence, sea surfaces are much warmer along the equator than at the poles. Ocean and atmosphere move because they are fluid.
5. A tsunami fills fresh water sources, such as streams, lakes, aquifers and reservoirs with saltwater while also contaminating the soil. Salt inhibits plant growth and can render farmland sterile for several years. The entire contents of commercial and industrial buildings can be washed out by the mass of water, and as a result, chemicals can get mixed together in dangerous combinations and may be washed out to sea or deposited on the ground. This mix includes raw sewage, which adds to the potential for disease. The rush of water can also undermine cliffs, hills and raised roadways that don't crumble immediately but become unstable and dangerous.
6. hope this helps u