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What are the layers of the earth’s atmosphere?


What are the layers of the earth’s atmosphere?

0 • We live in the troposphere. • Most weather occurs here such as rain clouds. • It is 10 km (6.2 miles) deep. • The other layers are the stratosphere, the mesosphere, the thermosphere and the exosphere. • The stratosphere is the important region where the ozone hole and global warming originate. What is Ozone? • Ozone forms a layer in the stratosphere. • It is thinnest in the tropics (around the equator) and denser at the poles. • Ozone is measured in Dobson Units (DU). • There is typically around 260 DU near the tropics and higher elsewhere. • Ozone is created when ultraviolet radiation (sunlight) strikes the stratosphere, splitting oxygen molecules (O2) to atomic oxygen (O). The atomic oxygen quickly combines with other oxygen molecules to form ozone. What are chloroflurocarbons (CFC’s) and where do they come from? • Chloroflurocarbons are a common indus

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