What caused the mass extinctions 65 million years ago that ended the Age of Dinosaurs?
A) major bolide impact
B) massive volcanic eruptions
C) global glaciation
D) all of the above
Correct Answer:
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Q19: Earth's climate system involves interactions between the
Q20: Solar energy energizes all of the following
Q21: The plate tectonic system is driven by
A)magnetism.
B)the
Q22: Elevation of the ground surface is measured
Q23: The three major global geosystems are
A)climate system,solar
Q25: Earth's major layers include (from outermost to
Q26: Continental crust is _ oceanic crust.
A)less dense
Q27: When did biology's Big Bang (evolutionary explosion)occur?
A)approximately
Q28: The Mohorovičić discontinuity coincides with the _
Q29: Earth's atmosphere has been oxygen-rich for _
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