Earth Science: Geology, the Environment, and the Universe

Section 1: The Early Earth

The Early Earth

1
The oldest rocks on Earth are __________.
A)3.5 billion years old
B)3.96 to 3.8 billion years old
C)1.6 to 1.8 million years old
D)1 to 2 billion years old

2
How were asteroids and meteorites a heat source for Precambrian Earth?
A)Their impact on Earth generated energy.
B)Their bombardment of Earth caused them to sink to the core.
C)Their gravitational contraction generated energy.
D)Their radioactive decay of isotopes generated energy.

3
What evidence supports the hypothesis that Earth is 4.6 billion years?
A)the age of rocks from the Moon
B)Their bombardment of Earth caused them to sink to the core.
C)Their gravitational contraction generated energy.
D)all of the above answers are correct
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