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Author Question: Which best describes Mercury's plains? a. heavily impacted with craters and large rays b. ... (Read 81 times)

karen

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on: Jul 27, 2018
Which best describes Mercury's plains?
 
  a. heavily impacted with craters and large rays
 b. solidified lava flows that are a uniform gray color
  c. a geologically active surface of molten lava
 d. solidified lava flows rich in dark basalts
 e. a rich layer of soil containing iron and silicate

Question 2

A planetary nebula is a(n) ____.
 
  a. expanding envelope of ionized gas expelled by a dying medium-mass star
 b. expanding envelope of neutral gas and dust expelled by a dying medium-mass star
 c. contracting envelope of dusty material from planets destroyed by a dying medium-mass star
  d. contracting envelope of ionized interstellar medium absorbed by a dying medium-mass star
  e. expanding atmosphere of a medium-mass star as it becomes a red giant


soda0602

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Reply #1 on: Jul 27, 2018
Answer to Question 1

b

Answer to Question 2

a


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