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Home Q & A Board Science-Related Homework Help Physics Astronomy
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Mrpkerzz Mrpkerzz
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6 years ago
Comet nuclei contain _____.
 
  A) carbon monoxide
  B) nonvolatile liquids
  C) molten iron
  D) sodium chloride

Question 2

_____ are massive objects destined to become planets.
 
  A) Planetesimals
  B) Protoplanets
  C) Preplanets
  D) Pseudoplanets

Question 3

Which of the following statements is true in the context of radioactive elements?
 
  A) The abundances of the daughter isotopes of radioactive elements in a rock gradually decrease.
  B) The abundance of a radioactive element in a rock gradually decreases.
  C) Uranium-238 has the longest half-life among all the other radioactive substances.
  D) Potassium-40 has the longest half-life among all the other radioactive substances.

Question 4

Unlike Mercury, Saturn:
 
  A) is a low-density planet.
  B) formed along with the Sun.
  C) formed along with Earth.
  D) is a Terrestrial planet.

Question 5

Which of the following is true of carbonaceous chondrites?
 
  A) They contain materials left over from the formation of the Solar System.
  B) They do not contain any volatile compounds.
  C) They are a class of iron meteorites.
  D) They are a class of stony-iron meteorites.
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VickyhungVickyhung
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6 years ago
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Mrpkerzz Author
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6 years ago
This calls for a celebration Person Raising Both Hands in Celebration
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