Heat left over from this planetary formation process along with radioactive decay, drives the Earth's internal heat engine.
A) substitution
B) fusion
C) sublimation
D) differentiation
E) fission
Correct Answer:
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Q23: _ is the closest moon to Jupiter
Q24: Our galaxy is called the _.
A) Oort
Q25: Perhaps the most obvious of _ surface
Q26: The Earth's atmosphere is rich in _,
Q27: To measure vast distances in the solar
Q29: The sun, its eight planets and their
Q30: To the best of our knowledge, the
Q31: Astronomers estimate that our galaxy contains _
Q32: As planetismals struck the growing Earth, their
Q33: _ are small, planetlike bodies.
A) Planetesimals
B) Moons
C)
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