Geologists estimate that Earth formed __________ years ago.
A) 4.6 billion
B) 46 million
C) 4.6 million
D) 46 billion
Correct Answer:
Verified
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
Q33: Homo sapiens and our direct ancestors have
Q34: Our Solar System formed:
A) when a fiery
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)
Q39: Ground water saturating rock underground is a
Q40: The fundamental source of energy that drives
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