Answer the following questions
What is the need for air?
What is atmosphere? Write its different layers
What is the importance of ozone gas?
Describe the composition of air?
How can you say that air exerts pressure?
Write any five uses of water.
What do you mean by sedimentation and decantation?
What is distillation?
ACTIVITIES
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Air is important for living things.
People need to breathe, and so do lots of other animals—and plants! Breathing is part of a process called respiration. During respiration, a living thing takes in oxygen from the air and gives out carbon dioxide.
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