Hydrosphere refers to the combined mass of water :

1. in the oceans
2. rivers, streams and lakes
3. in the atmosphere
4. All of the above.

Water is not usually thought of as a solid, and only a small fraction of the Earth's water is in a solid state, in the form of ice. This ice includes all forms of frozen water, from the ice sheets at the North and South poles to icebergs, ice on the top of mountains, frozen lakes in the winter, or even the ice in a freezer. Though all the ice on earth is part of the hydrosphere, the frozen aspect is known as the cryosphere. This frozen water is three-fourths of the earth's freshwater, which makes it quite important. Identify other sources of fresh water.

1. rivers, lakes and streams
2. underground water
3. reservoirs and dams
4. All of the above.

Assertion (A): Waves are oscillatory movements on the surface of the sea.

Reason (R): Waves result from the action of wind on the surface of the sea.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.

Name the rise and fall of sea water due to the gravitational forces of the sun and the moon:

1. Tides
2. Waves
3. Spheres
4. Oscillations