As planetismals struck the growing Earth, their impact energy in combination with ______ melted the planet.
A) heat from the sun
B) energy left over from the Big Bang
C) radioactivity
D) cosmic rays
E) the greenhouse effect
Correct Answer:
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Q27: To measure vast distances in the solar
Q28: Heat left over from this planetary formation
Q29: The sun, its eight planets and their
Q30: To the best of our knowledge, the
Q31: Astronomers estimate that our galaxy contains _
Q33: _ are small, planetlike bodies.
A) Planetesimals
B) Moons
C)
Q34: Large, smooth, dark areas visible on the
Q35: _ is the largest planet in both
Q36: _ is the smallest of the inner
Q37: The Moon's low average density tells us
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