Ch.5 Water Surrounding the Earth
A. Tick in the correct option .
1 . The water cycle is ----
(a ) the continuous movement of water .
2. The three states of water are--
( b ) solid , liquid , gas.
3. What turns water on the earth into vapours in the water cycle ? ( c ) the sun
4. When clouds get too heavy to hold water ---
( b ) the water falls on the earth.
5. Which is the only warm current from among the followings?
( c ) Kuroshio
5 In coastal areas,warm ocean current cause --
(b) Rainfall
B. Fill in the blanks:
1. The largest natural source of water is ocean/rain.
2. When the level of ocean water rises , it is a high tide .
3. Kolkata to port in India is an example of tidal port .
C. Give a technical term for each of the following statements.
1. The process in which water is converted to water vapours through heat of the sun.
Evaporation.
2. The continuous circulation of water in the three spheres of the earth .
Water Cycle
3. A movement in the ocean in which water particles move up and down.
Waves.
4. It is the purest form of water.
Rainfall
5. Periodic rise and fall in the level of the ocean water.
Tides
D. Answer the following questions in brief .
1 On what factors does the height of a wave depend ?
Ans. The height of the wave depends upon the speed of wind and the duration of wind blowing from the particular direction.
2 Define an ocean current .
Ans. The ocean current is the continuous movement of a mass of water in a particular direction.
3. How are tides caused ?
Ans. Tides are caused due to the gravitational pull of the moon and the sun.
4. Name the important components of the water cycle.
Ans. Important components of the water cycle --
Evaporation , Condensation and Precipitation.
5. Name three valuable resources which are found in abundance in the ocean.
Ans. Gold, platinum and mineral oil are the valuable resources found in abundance in the ocean.
E. Answer the following questions .
1. How are tides useful to us ?
Ans. Tides useful to us in the following ways:
a. High tides help in navigation.
b. Tides are also helpful in generating electricity.
c. They help in fishing.
2 . How are oceans beneficial to us in improving the quality of life ?
Ans. The ocean facilitated the countries and regions to trade with one another. Goods can be moved in a very large quantity by ships and the transportation is cheaper than any other mode of transport. The Marine environment provides animal and plants life in abundance for food and trade.
3. Explain the water cycle with the help of a diagram .
Ans. The water is converted into water vapours by the process of evaporation. This vapours rise up in the atmosphere and condensed into a crystal of ice or droplets of water to form clouds. When the condensed ice crystals or water droplets grow in size and are unable to float, they fall down over the Earth's surface as precipitation. It is because of this never-ending circulation that the process is described as water cycle.
4 Explain the effects of ocean currents .
Ans. The effects of ocean currents-
A.Warm currents raise the temperature along the coast, while cold currents drop the temperature along the coast.
B.Winds blowing over warm currents result in a good amount of rainfall.
C. Ocean currents also help in navigation and transport.
5. Suggest four ways to help people affected by devastation due to Tsunami .
Ans. There are four ways to help people affected by devastation due to Tsunami ---
1. Supply them with food and water.
2. Move them to safe place.
3. Bring first aid and medical help as soon as possible.
4. We can collect fund for them. · 5. We can donate our clothes.
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