1. Answer the following questions.
(i) What is precipitation?
(ii) What is water cycle?
(iii) What are the factors affecting the height of the waves
(iv) Which factors affect the movement of ocean water?
(v) What are tides and how are they caused?
(vi) What are ocean currents?
2. Give reasons.
(i) Ocean water is salty.
(ii) The quality of water is deterioting.
Answers
Explanation:
(i) Precipitation is any liquid or frozen water that forms in the atmosphere and falls back to the Earth. It comes in many forms, like rain, sleet, and snow.
(ii) The water cycle is the path that all water follows as it moves around Earth in different states. Liquid water is found in oceans, rivers, lakes—and even underground. ... The water cycle is the path that all water follows as it moves around our planet.
(iii) The factors affecting the height of the waves are as follows: Speed of the wind. Earthquake, Volcanic eruptions or Underwater landslides.
(iv)An ocean current is any more or less permanent or continuous, directed movement of ocean water that flows in one of the Earth's oceans. The currents are generated from the forces acting upon the water like the earth's rotation, the wind, the temperature and salinity differences and the gravitation of the moon.
(2) (i) Salt in the ocean comes from two sources: runoff from the land and openings in the seafloor. Rocks on land are the major source of salts dissolved in seawater. Rainwater that falls on land is slightly acidic, so it erodes rocks. ... Ocean water seeps into cracks in the seafloor and is heated by magma from the Earth's core.
(ii) Ocean water contains large amounts of dissolved salts. Hence it is salty. ... Answer: Water quality is deteriorating because of pesticides, toxic and hazardous wastes, litter and rubbish, decayed organic materials and chemicals.