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July 31, 2015

Homework Help: science

Posted by Delilah on Wednesday, September 26, 2012 at 7:15pm.

1.
Force exerted on an area is called _____. (1 point)

pressure
temperature
gravity
mass

2.
The composition of the atmosphere is changing due to _____. (1 point)

smog
ozone depletion
increase in CO2 (carbon dioxide)
all of the above

3.
The _____ is the layer of the atmosphere farthest from Earth's surface. (1 point)

exosphere
troposphere
stratosphere
ionosphere

4.
Chlorofluorocarbons harm the ozone layer by _______. (1 point)

adding more ozone molecules
blocking ultraviolet radiation
destroying ozone molecules
destroying oxygen molecules

5.
Air pressure is greatest _____ because there are _____ molecules of air pushing down from above. (1 point)

at the top of a mountain; more
at sea level; more
in the troposphere; less
in the exosphere; less

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