We cannot ___ air, but we can ___ it.

_____ supports burning and is necessary for living organisms.

Air occupies ____.

Take a lump of dry soil in a beaker or a glass. Add water to it and note what happens. Do you see bubbles coming out? These bubbles indicate the presence of ___ in the soil.

Plants and animals depend on each other for exchange of ____ and ____ from air.

The envelope of air that surrounds the earth is known as _____.

Windmills are used to generate _____.

Smoke contains a few ___ and fine ___ particles and is often harmful.