(i) Falling of moisture in the form of rainfall. snow, fog, sleet and hailstone is termed as precipitation,
(ii) The water cycle is the process by which water continually changes its form and circulates between oceans. atmosphere and land,
(iii) Winds. earthquakes. volcanic eruption or under water landslides are the factors affecting the height of the waves, The stronger the wind blows. the bigger the wave becomes,
(iv) Temperature. winds. gravitational pull of the sun. the earth and the moon; warm and cold currents are the factors that affect the movement of ocean water,
(v) Tides are the rhythmic rise and fall of ocean water that occur twice in a day. The strong gravitational pull exerted by the sun and the moon on the earth's surface causes the tides.
(vi) Ocean currents are streams of water flowing constantly on the ocean surface in definite directions.