Section #: 22.1
The Early Earth
Practice Test
1.
How were asteroids and meteorites a heat source for Precambrian Earth?
a.
Their bombardment of Earth caused them to sink to the core.
b.
Their impact on Earth generated energy.
c.
Their radioactive decay of isotopes generated energy.
d.
Their gravitational contraction generated energy.
Hint
2.
What evidence supports the hypothesis that Earth is 4.6 billion years?
a.
all of the above answers are correct
b.
the age of rocks from the Moon
c.
the age of meteorites
d.
the age of zircon grains in granitic crustal rocks
Hint
3.
The oldest rocks on Earth are __________.
a.
3.5 billion years old
b.
1.6 to 1.8 million years old
c.
1 to 2 billion years old
d.
3.96 to 3.8 billion years old
Hint
