Living organisms have been on Earth for _________ of Earth's history.
A) less than 1%
B) approximately 20%
C) approximately 50%
D) approximately 80%
Correct Answer:
Verified
Q13: According to the principle of uniformitarianism,
A)geologic processes
Q14: What powers Earth's external heat engine?
A)gravitational energy
B)radioactive
Q15: How old is Earth?
A)approximately 4.5 thousand years
B)approximately
Q16: In which of the following subsystems is
Q17: Which of the following statements regarding the
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
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