Which of the following describes the concentration of CO2 in the lower atmosphere?
A. It is 30 percent higher than it was 300 years ago.
B. It has stabilized.
C. It is not related to the amount of forest cover on Earth.
D. The present average measurement is 150 ppm.
Answer: A
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The movement of water in a wave travels
A. with the wave. B. in a circular path at a depth of one-half the wavelength. C. in a circular path at and just below the water surface. D. in both a longitudinal and circular path.
The main distinguishing factor between the three tropical climate types is
A) latitude. B) elevation. C) temperature. D) seasonal behavior of rainfall.
Any animal that relies on only one or two sources of food is known as a(n) ____________________
Fill in the blank(s) with correct word
A(n) ________ stream is actively eroding or depositing material in its channel so that its gradient is adjusting to carry the sediment load
A) disequilibrium B) ungraded C) channel D) equilibrium E) graded