A substantial fraction of the water found on Earth is believed to have come from
A) the impact that produced the Moon.
B) water-rich comets.
C) Earth's brief migration outside the snow line.
D) the combination of primordial hydrogen with oxygen produced by green plants.
Correct Answer:
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Q20: What are the three "common" substances that
Q21: The ice giants are
A) Jupiter and Saturn.
B)
Q22: The manner in which the large, outer
Q23: What is the Kuiper belt?
A) band of
Q24: The large gravitational influences of the gas
Q26: A small body orbiting the Sun has
Q27: The region outside the orbit of Neptune
Q28: In the Nice model of solar system
Q29: According to current theories of planetary formation,
Q30: The large gravitational influences of Jupiter and
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