Based on the evidence that atmospheric carbon dioxide is a cause of planetary warming, what aspect of the graphs should most concern us?
A. The carbon dioxide concentration today is significantly higher than at any time in the past 800,000 years and is rapidly rising.
B. Earth's past temperature rises and falls naturally.
C. Earth's past carbon dioxide concentration rises and falls naturally.
Ans: A. The carbon dioxide concentration today is significantly higher than at any time in the past 800,000 years and is rapidly rising.
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In an electromagnetic wave, 1) how are the electric and magnetic field directions related and 2) how is the direction of travel determined from their directions? (
is the velocity of the light wave.)
A.
.B.
C.
D.
E.
Limestone is a common type of
A) metamorphic rock B) meteoritic rock C) igneous rock D) sedimentary rock
The orbital motion of a wave is greatest (has the largest "diameter") at
A) the wave base. B) about one-half the depth of the wave base. C) a depth of one-half the wavelength. D) the surface.
What is a "super-Earth"?
A) a rocky planet that is more massive than Earth B) a rocky planet that has more water than Earth C) a jovian planet that is approximately the same mass as Earth D) a jovian planet that has a solid surface E) a rocky planet that is closer to its host star than Earth is to the Sun