Over the last three decades in the United States,
A) soil erosion has steadily increased while wind erosion has steadily decreased.
B) estimates and actual measurements indicate that soil erosion has decreased.
C) the increased reliance on plowing and technology has increased soil and wind erosion.
D) measurements of the amount of soil in major rivers indicate great increases in soil erosion.
B
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A) Sub-Saharan Africa B) Southwest Asia and North Africa C) Former Soviet republics D) Eastern Europe E) China
Tidal height is compared to what reference level?
a. mean sea level b. amphidromic point c. tidal range d. bore point e. tidal datum
The continental rise is a product of ________.
A. sedimentation B. seismic upheaval C. volcanic activity D. All of these are correct. E. None of these is correct.
The sky is blue because air molecules selectively ____ blue light
a. ?scatter b. ?absorb c. ?diffract d. ?disperse e. ?emit