Humans have been on Earth for ___ of Earth's history.
A) less than 1%
B) approximately 50%
C) more than 90%
Correct Answer:
Verified
Q24: In the plate tectonic system, the lithospheric
Q25: Which of the following rock types would
Q26: The Earth has had a magnetic field
Q27: Which of the following statements is true?
A)
Q28: What is the lower mantle made up
Q30: When did our solar system form?
A) about
Q31: Evidence in the rock record shows that
Q32: About when did the first animals evolve
Q33: About when are Homo sapiens thought to
Q34: How did Earth's atmosphere become oxygenated?
A) volcanic
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