Air, Water & Weather Worksheet-19
True / False
Clouds are formed when water vapour condenses into tiny water droplets.
On cold winter mornings, the droplets of water seen on the grass and leaves is called dew.
Water evaporates from lakes and rivers by the heat of the sun.
Water evaporates from oceans and other water bodies by the heat of the sun.
Water from taps can be dirty and impure.
More than 90% of the Earth's surface is covered with water.
Water exists in only one form in nature.
The process of change of water into water vapour is called condensation.
Air, Water & Weather Worksheet-20
True / False
On cold winter mornings, the droplets of water seen on the grass and leaves is called fog.
Boiling is the simplest way to purify water.
Boiling the water for at least 10 minutes kills the germs in it.
Boiled water should be stored in clean and covered pots or bottles.
Sedimentation is the method of purifying water.
Decantation is the method of purifying water.
The process in which the insoluble impurities settle down is called sedimentation.
The process in which the water is gently poured after sedimentation is called decantation.
Air, Water & Weather Worksheet-21
True / False
In filtration process, water is passed through a filter paper.
The process in which water is cleaned by passing it through filter paper is called filtration.
Chlorine is a gas that kills germs.
The process of adding chlorine tablets to water and making the water pure is called chlorination.
We should not waste water.
Water is very precious.
We should keep drinking water covered.
We should never keep drinking water near bins and drains.
