Homo sapiens and our direct ancestors have been abundant on our planet for about __________ percent of Earth history.
A) 0.1
B) 1.0
C) 10
D) 50
Correct Answer:
Verified
Q28: The Earth's mantle is found in the:
A)
Q29: The core is:
A) the least dense layer
Q30: Oceans:
A) cover 7 percent of the Earth.
B)
Q31: The Earth's population (in mid-2009) was about
Q32: Earth's surface systems are ultimately powered by
Q34: Our Solar System formed:
A) when a fiery
Q35: Geologists estimate that Earth formed _ years
Q36: A tectonic plate is composed of:
A) cool,
Q37: The crust is about:
A) 5-10 km thick.
B)
Q38: Earth's crust is part of the:
A) hydrosphere.
B)
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