What do these teardrop-shaped hills (drumlins) record?
A. melting of large blocks of rock in the ice
B. ancient lake levels
C. erosion and sculpting of soft materials by a moving glacier
D. piles of sediment recording past positions of the end of the glacier
Answer: C
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?Match the term with the most appropriate description.
A. ?open, sunlit surface layer away from the shore B. ?large natural bodies of standing freshwater C. ?deeper water lying between the limnetic zone and the lake bottom D. ?lakes that have a small supply of plant nutrients E. ?land area that delivers runoff to a stream, lake, or wetland
Earth hits its perihelion position in January. Solar radiation is proportional to the distance squared between the sun and the earth, so why isn't it hot in "winter" at perihelion?
A) Precession modifies the effect as the earth wobbles on its axis. B) The ellipticity of the orbit is small, so the affect is small; seasons are caused by tilt of the earth's orbit. C) It is; it is called summer in the Southern Hemisphere, and there is just a time lag for the Northern Hemisphere. D) None of these is correct.
The electric field strength between a pair of oppositely charged parallel plates is
A. composed of field lines curved in opposite directions. B. uniform. C. stronger at the ends. D. none of the above
Subduction is not always accompanied by compression and thrust faulting in the overriding plate. This is especially true when
A. the overriding plate is moving toward the subducted slab relative to the asthenosphere. B. an accretionary prism has developed at the convergent plate boundary. C. no magma is created by the subduction process. D. the overriding plate is either not moving toward the subducted slab relative to the asthenosphere, or it is moving away.