# Layers and density - PowerPoint PPT Presentation

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Layers and density. http://science.howstuffworks.com/nature/climate-weather/atmospheric/weather3.htm. http://www.obspm.fr/actual/nouvelle/nov05/titan.en.shtml. Bolide falling to earth. Lake effect snow over the Great Lakes. II. The atmosphere .

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Layers and density

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### Layers and density

http://science.howstuffworks.com/nature/climate-weather/atmospheric/weather3.htm

http://www.obspm.fr/actual/nouvelle/nov05/titan.en.shtml

Bolide falling to earth

Lake effect snow over the Great Lakes

### II. The atmosphere

• A. The atmosphere is the ocean of gases, held in by gravity, that surrounds our planet. It is a mixture of gases.

• Page 14 of the ESRT has a graph of the characteristics that change with altitude.

• Page 1 shows us that the lowest level, called the troposphere, is primarily nitrogen and oxygen.

• Water vapor is found ALMOST only in the troposphere, which is where ‘weather’ occurs.

### III. The atmosphere

• A. Using the page of the ESRT, notice the following:

• the atmosphere is divided according to the way in which temperature CHANGES with altitude.

• Atmospheric pressure steadily decreases with altitude. The greatest pressure is at sea level, due to the weight of overlying molecules.

• Pressures are given as negative exponents.

• Water vapor concentrations are greatest at sea level, and almost nonexistent above the tropopause.

• B. The levels of the atmosphere.

• The troposphere has the greatest concentration of water vapor and the greatest pressure.

• The stratosphere contains ozone, which absorbs ultraviolet (uv) rays, causing it to warm with increases in altitude.

• Ozone is a form of oxygen, O3 very different than breathable oxygen,O2.

• Ultraviolet light is a form of very powerful electromagnetic energy.

### Practice

• What is the temperature range of each of the layers?

• What is the altitude of the tropopause?

• In what layer is the air pressure 10-3?

• What is the pressure at sea level?

• What is the temperature at a height of 25 miles?

• What level controls incoming ultraviolet light?

• Review Book: ch. 7 page 170-171 read.

Classzone.com for weather for the atmosphere go to:

http://www.classzone.com/books/earth_science/terc/content/investigations/es1702/es1702page01.cfm