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Layers and density. 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

Layers and density

Layers and density

Bolide falling to earth

Layers and density

Lake effect snow over the Great Lakes

Ii the atmosphere

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

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.

Layers and density

  • 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.



  • 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.

Layers and density for weather for the atmosphere go to: atmosphere questions

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