Wind erodes rock by
A. applying the force of air molecules to rock.
B. grinding airborne sediments against rock and carrying away small fragments.
C. applying water vapor molecules to rock.
D. none of these
Answer: B
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What proportion of food products sold on U.S. supermarket shelves contains some form of genetically engineered crop?
a. 20% b. 30% c. 50% d. 60% e. 70%
A tsunami can occur ________.
Fill in the blank(s) with the appropriate word(s).
Streams draw their water from a region known as the
A. drainage lake. B. drainage basin. C. drainage aquifer. D. drainage divide.
The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground as others. These twice-as-high apples, for the same mass, have
A) one-quarter the weight. B) one-half the weight. C) practically the same weight.