The U.S. imports over 50% of its petroleum, mostly from what country?
a. Saudi Arabia
b. China
c. Brazil
d. Canada
e. India
d
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The product of the breakdown of surface rocks by weathering and erosion is __________
Fill in the blank(s) with the appropriate word(s)
Blight fungus kills U.S. chestnut trees because the trees ________
A) release the fungus in the leaves that fall to the ground and the fungus is absorbed in the soil B) release the fungus into the soil and it is drawn up in the roots C) are hosts to the vectors of the fungus D) have not matured long enough to survive E) have not coevolved with the fungus
An aneroid barometer measures air pressure using mercury or other liquids
Indicate whether the statement is true or false
If you see a lightning stroke and then, 15 seconds later, hear the thunder, the lightning is about ____ miles away.?
a. ?45 b. ?15 c. ?5 d. ?3 e. ?1.5