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GEOG 1112: Lecture 4
RED NOTE: In what layer were the shooting stars described? |
Mesosphere |
RED NOTE: In the troposphere, air behaves like ________. |
a fluid |
Uppermost layer |
Thermosphere |
Coldest layer |
Mesosphere |
Contains the ozone layer |
Stratosphere |
Auroras occur here |
Thermosphere |
Noctilucent clouds occur here |
Mesosphere |
Ionosphere occurs here |
Thermosphere and Mesosphere |
Temperatures rise sharply (up to 2200 degrees F) |
Thermosphere |
RED NOTE: UVB is the chief cause of _________________. |
sunburn, much skin cancer cataracts |
RED NOTE:
UVA rays cause ________________________. |
leathery, wrinkled, sagging skin |
RED NOTE: How many ozone molecules can one chlorine molecule destroy? |
Thousands and thousands |
RED NOTE: When will the ozone hole be back to “normal” (1980) levels? |
2070 |
How many oxygen molecules does ozone have? |
3 |
The ozone layer absorbs ______ of the UVC (ultraviolet C) rays |
100% |
The ozone layer absorbs ____ of the UVB (ultraviolet B) rays. |
90% |
Most of the ultraviolet rays that make it to the earth are __________. |
UVA (ultraviolet A rays). |
Until the 20th century, the ozone layer had been _________________. |
relatively stable |
Which was most responsible for thinning the ozone layer?
|
CFC's |
The __________________ help make the ozone layer thinnest over the poles. |
polar vortex and polar stratospheric clouds |
The ozone layer is ____________________.
|
thinning, particularly in the upper latitudes. |
The ____________ was adopted in 1987 banning CFCs
|
Montreal Protocol |
Troposhere |
1. Lowest (closest to earth) layer of the atmosphere: the one where we live.
2. 90% of the total mass of the atmosphere: bulk of all water vapor, clouds, and air pollution.
3. The tropopause is the troposphere’s upper limit. Its height varies over time and place. |