Comets are made up primarily of ________.
A) iron-nickel alloys
B) silicate minerals,like rocks on Earth
C) frozen hydrogen
D) frozen water,carbon dioxide,and methane
Correct Answer:
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Q22: Light elements like hydrogen and helium form
Q23: The _ refers to the sum total
Q24: The Oort cloud is _.
A)an unusual type
Q25: The asthenosphere is actually a part of
Q26: In correct order from the center outward,Earth
Q28: Oceanic crust is generated at _.
A)hot spots
Q29: The _ is the thinnest layer of
Q30: Continental shields and platforms represent _.
A)sites where
Q31: The composition of the earth's inner core
Q32: Soil belongs to the _.
A)hydrosphere
B)atmosphere
C)geosphere
D)biosphere
E)All of the
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