Which of the following landforms is not a permafrost feature?
a. ice-wedge polygons
b. pingos
c. patterned ground
d. boulder pavements
d
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On average, the atmosphere absorbs roughly this percentage of the solar radiation that reaches the top of the atmosphere:
A) 5 percent. B) 14 percent. C) 25 percent. D) 50 percent.
Atmospheric nitrogen
A) is highly reactive. B) owes its existence to the actions of micro-organisms. C) stays in the atmosphere for a long time. D) was mostly captured from outer space by the Earth's gravitational field. E) has a molecular weight that is higher than that of oxygen.
The most likely total number of species on Earth is estimated to be between ________
A) 6 and 12 million B) 12 and 40 million C) 100 and 200 million D) 600 and 900 million E) 1 and 2 billion
Plants appear green to us because they ____
a. absorb green wavelengths b. reflect blue wavelengths c. reflect green wavelengths d. absorb all visible wavelengths e. reflect all visible wavelengths