9-14-12 Science Lesson 7.5

Science Lesson 7.5

*Earth is surrounded by an envelope of gases called the atmosphere.   

* The earth’s atmosphere is dry air composed of nitrogen, oxygen, carbon dioxide, water vapor and other gases.

*Water forms thin, feathery clouds of ice at the top of the troposphere.

*Water vapor-invisible tiny droplets of liquid water in the air.

*Clouds form when water vapor condenses out of the air.

*The stratosphere contains the ozone layer.

*The ionosphere is the lowest layer of the thermosphere.

*Most meteoroids burn up in the mesosphere.

*The four layers of the atmosphere are: Troposphere, mesosphere, stratosphere, and thermosphere.

*In the thermosphere, air temperatures can reach up to 1800 degrees Celsius.

*As a hot air balloon rises from 0km to 6km, air density decreases.