Air

__** What is Air? **__

﻿ Clickview: Learning About Air

Gases in Air: Nitrogen, Oxygen, Carbon Dioxide & others. What are the percentages of each? What are some uses of each?

__** The Carbon Cycle **__

**Photosynthesis**: plants makes their food by using carbon dioxide from the air & energy from the sun﻿; plants return oxygen to the air as a by-product ﻿ **Respiration**: animals breathe in oxygen from the air; animals breathe out carbon dioxide



__** The Atmosphere **__

Layers: 1.Troposphere 2.Stratosphere 3. Ozone Layer 4. Mesophere 5. Thermosphere (ionosphere)

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__** Properties of Air **__


 * Air takes up space
 * Air has weight
 * Air exerts pressure
 * Air can be compressed

__** Forces of Air **__

A **force** is a push or a pull that causes an object to either: - increase or decrease its speed - change its direction - change its shape. If any of these things happen then a force must be acting on the object in question.


 * Forces acting on a parachute **




 * Forces acting on a plane **

Why Do Planes Soar?

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