(2) The water in the ocean is very __________ in taste.

(3) The process of conversion of vapour into liquid is known as __________.

(4) Falling of __________ is called precipitation.

(1) Large part of the where is earth’s surface is covered with __________.

(5) Most of the water that human beings use comes from __________.

(1) Oceans are the major source of sweet water

(2) The process of condensation is opposite to evaporation.

(3) Rains feed almost all other sources of water.

(4) Our body contains about 98% of water

(5) The groundwater is actually the rain water. 

(3) What is water pollution?

(1) Explain the states of water

(2) Explain rainwater harvesting.

(4) What are the causes of flood and drought?

(5) Write the names and symptoms of four water–borne diseases.

(1) What percentage of water is found in human blood and a fish?

(2) Write the two major sources, each of natural water, surface water and underground water.

(3) Give the answer the following: (a) Which source of water contains the highest concentration of salt in it? (b) Why is spring water pure enough for drinking but unsuitable for laboratory use?

(4) Why is sometimes flood benefits to farmers?

(5) Write the four benefits of water

(1) Explain the ground water.

(2) What is the water table?

(3) Explain water cycle.

(4) Write the definitions of the following: (a) Solute (b) Solvent (c) Solution (d) Saturated solution (e) Aqueous solution

(5) Define the following: (a) Sterilization (b) Sedimentation (c) Loading (d) Aeration

water cycle

Sea water

Rainwater

88%

100°C