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Author Question: What caused Earth to partially melt when being formed? a. Impact of asteroids, comets, and debris ... (Read 17 times)

cdr_15

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on: Aug 22, 2018

What caused Earth to partially melt when being formed?
  a. Impact of asteroids, comets, and debris
  b. Gravitational compression
  c. Accumulation of decaying radioactive elements
  d. A combination of all of these choices



Question 2

What key characteristic marks the beginning stages of the collapse of a star?
  a. The increase in temperature
  b. The depletion of carbon and oxygen
  c. The depletion of hydrogen
  d. The expulsion of energy



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fatboyy09

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Reply #1 on: Aug 22, 2018
Answer to Question 1

ANS: D
Asteroids, comets, and debris heated the surface of Earth. Combined with gravitational compression
and decaying radioactive elements, this caused Earth to partially melt. Information can be found in the
section Earth, Ocean, and Atmosphere Accumulated in Layers Sorted by Density



Answer to Question 2

ANS: C
The lack of hydrogen in a star marks its death. The rapid compression of the core then causes the
internal temperature to increase. In turn, this allows for the formation of heavy metal atoms.
Information can be found in the section Stars and Seas



cdr_15

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Reply #2 on: Aug 22, 2018
Both answers were spot on, thank you once again


fatboyy09

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Reply #3 on: Aug 22, 2018
Great! Please up vote :D


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