What causes wind?
A.
differences in land elevation on a continent
B.
air flowing from a high pressure area to a low pressure area
C.
gravity pull caused by the moon moving farther away from the earth
D.
the angle at which the rays from the sun hit the atmosphere

Explain how scientists use geologic time to determine the age of landforms.

Which of the following human activities resulted in the growth of the north american deer population?

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere