Q.1: What is precipitation ?
Ans: Precipitation is a form of liquid that falls back on earth from the atmosphere in the form of rain, snow, sleet, etc.
Q.2: What is water cycle ?
Ans: The process by which the water changes its form continuously and circulates between oceans, atmosphere and land is known as water cycle.
Q.3: What are the factors affecting the height of the waves ?
Ans: Wind, earthquake, volcanic eruption and tsunami are the factors affecting the height of the waves.
Q.4: Which factors affect the movement of ocean waters ?
Ans: Temperature, wind, gravitational pull of the sun, earth and moon, warm and cold currents are the factors affecting the movement of ocean waters.
Q.5: What are tides and how they are caused ?
Ans: The rhythmic rise and fall of ocean water twice in a day is called a tide. It is caused by the strong gravitational pull exerted by the sun and the moon on the earth’s surface.
Q.6: What are ocean currents ?
Ans: Ocean currents are streams of water flowing constantly on the ocean surface in definite directions.