Select Air is a mixture of

Select the main gases present in air

Trees take ____ gas from surrounding

Substance which pollute the air are

Which of the following is present in large amount in the air?

What is the gaseous form of water called?

Name a gas which becomes a pollutant if its amount increases in the air

What should we wear to allow clean air to enter our nose?

What is the percentage composition of nitrogen in air?

___________________ gas is used to extinguish fire.

All animals breathe

How many percent of oxygen is present in the air

Select all of the gases that are important for the growth of the plants

These are the sources of water.

Which water source is saltwater?

Which water source covers most of the Earth?

What natural source of water is this?

What natural source of water is this?

What natural source of water is this?

Check all the boxes that are characteristics of a stream.

Fresh water is used for

Sources of fresh water are

what is rooftop rainwater harvesting ?

____________ make food for the plant.

These are unwanted plants

When plants make their food, they release a gas called ________ into the air.