If Earth's atmosphere were appreciably thicker, snow would appear
A) still white.
B) yellow.
C) blue.
D) ultraviolet.
Answer: B
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The lengthening of the wavelength of a photon as it escapes from a gravitational field is known as__________
A) gravitational blueshift B) gravitational redshift C) photonic adaptation D) photon occultation
The stability of a bicycle is due to angular momentum of the wheels when the bicycle is moving forward. The stability is due to the net angular momentum vector, which
A. points upward, perpendicular to the surface of Earth, thereby canceling the weight of the bicycle and rider. B. points to the rider's left. C. is actually zero, since the back wheel cancels the angular momentum of the front wheel. D. increases when the bicycle slows down due to conservation of energy.
In the context of the formation of planets in the solar nebula, the frost line marks the distance from the Sun beyond which
A) the temperature was low enough for hydrogen compounds to condense into ices. B) the temperature was low enough for solid rock to condense from the gas. C) hydrogen compounds were particularly abundant. D) planets could be cold enough to have snow.
Which epoch is also called the Ice Ages?
a. Permian b. Holocene c. Pleistocene d. Cretaceous