Consider the following planned experiment. Factor
Experimental Group
Control Group
amount of water
daily
daily
type of food
fresh grass
Vitamins
yes
housing
indoors
indoors
Which variable is being tested in this experiment?
fresh grass
no
A. Type of food
B. Amount of water
C. Housing
D. Vitamins

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he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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