Water as a resource

_________________________ is a

way of collecting rain water

from surfaces on which rain

falls , filtering it and storing

it for different uses.

Impurities that are not soluble in water and can easily be seen are called _______________impurities.

• insoluble

• soluble

Impurities that dissolve in water and are invisible are called _______________impurities.

• insoluble

• soluble

Water vapour is light , so it rises up (just like a gas balloon).As it moves up ,it comes in contact with cool air and changes into tiny droplets of water. This is called

______________.

The heat of the sun warms up the water in rivers , lakes , oceans and other water bodies . This water turns into water vapour . This process is called ____________.

In nature there is a continuous cycle in which water keeps changing its from . This is called ____________________.

All living things need water to __________.

• Dance

• Live

70% of the Earth is made of

• Saltwater oceans

• Freshwater oceans

• Saltwater seas

Which of these is the largest source of salt water?

• rivers
• lakes
• oceans
• streams

Green plants need water for.....

• photography.

• absorption.

• photosynthesis.

• synthesis.