In general, compared with soils on gentle slopes, soils on steep slopes will tend to be
A. more easily eroded.
B. better developed.
C. more clayey.
D. more acidic.
Answer: A
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The diagram below shows that C4 plants photosynthesize more efficiently than C3 plants at high temperatures. This is because
A) C4 plants make use of chemosynthesis as well as photosynthesis.
B) C4 plants are able to minimize water loss through the stomates more efficiently than C3 plants.
C) C4 plants make use of the Calvin cycle to photosynthesize over a wider range of hours, while C3 plants do not.
D) C4 plants have larger chloroplasts than C3 plants.
Which air mass is responsible for extremely cold outbreaks in North America?
a. maritime tropical b. maritime polar c. continental polar d. continental tropical
Where did the atmosphere originate?
A. mostly comets B. formed as Earth coalesced C. mostly out-gassing
Which of the following is considered to be an enclave?
A. Vatican City B. Italy C. the Kurds D. South Africa