This lesson will explain
- the thermal structure and chemical composition of the atmosphere,
- how the composition of the Earth's atmosphere has evolved over geologic time including out gassing, the origin of atmospheric oxygen, and
- the location of the ozone layer in the upper atmosphere, its role in absorbing ultraviolet radiation, and how it varies both naturally and in response to human activities.
What is Weather?
See how and why the state of our atmosphere changes from day to day.
Find out what people mean when they say it's "humid" outside.
See how all of the water on Earth is recycled again and again.
Learn how and why ocean currents move.
Learn the different cloud types and how they form.
See how smog and acid rain are formed.