What is a graben?
A) a mythical Norse sea monster, believed by the ancients to inhabit also the lunar maria
B) a field strewn with iron compounds
C) a geological formation created when neighboring surface regions separate and the region in between settles
D) a type of rock, composed mostly of iron and nickel, found (so far) only on the Moon
Correct Answer:
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Q203: What process created the lunar regolith?
A) successive
Q213: The surface of the Moon may be
Q215: A regolith is a(n)
A) extremely large, isolated
Q226: How old are the lunar maria?
A) less
Q233: How old are the lunar highlands?
A) 4.0
Q237: The type of rock that makes up
Q275: Spacecraft exploring the Moon in the 1990s
Q276: Some possible evidence for water has recently
Q277: The age of the Moon is determined
Q278: In 1994,the lunar-orbiting Clementine sent radio waves
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