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8 questions
Moving air is called ________
wind
fog
dew
The envelope of air that surrounds the earth is called ________
atmosphere
hydrosphere
lithosphere
Mountaineers carry _________ cylinders with them, while climbing mountains.
nitrogen
carbon dioxide
oxygen
Air is a mixture of many _________
solids
liquids
gases
___________ gas is necessary for burning
oxygen
nitrogen
carbon dioxide
__________ gas occupies the major part of composition of air.
nitrogen
oxygen
carbon dioxide
The ___ makes the windmill rotate.
wind
electricity
power
The burning of fuel produces ______
dew
wind
smoke
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