Why do lunar scientists think the surface of the moon was once a magma ocean?
A) Early lunar craters show a morphology suggesting impact with a liquid.
B) The lunar highlands contain large amounts of the rock anorthosite, which is the light material that "floated" on the top of the magma ocean.
C) The surface of the moon is entirely volcanic.
D) None of these is correct.
B
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What will be an ideal response
States that in an undisturbed succession of sedimentary rock layers, the oldest layer is at the
bottom and the youngest layer is at the top:a. principle of inclusions b. principle of superposition c. principle of cross-cutting relationships d. principle of lateral continuity e. principle of original horizontality
Since 1950, the number of tornadoes documented in the United States has ________
Fill in the blank(s) with the appropriate word(s).
Concessions granted by developing nations allow ________
A) timber extraction according to strictly sustainable forestry principles B) timber extraction by foreign multinational corporations C) the establishment of national parks D) establishment of wilderness areas E) restoration of deforested regions