Author Question: According to the solar nebula theory, planetary development in the solar nebula began with: A) ... (Read 116 times)

littleanan · **on:** Jul 27, 2018

According to the solar nebula theory, planetary development in the solar nebula began with:

A) the growth of dust grains.
B) the formation of ice caps.
C) the fission of helium atoms.
D) the fission of hydrogen atoms.

Question 2

The ice line is:

A) the freezing point of water in Venus's atmosphere.
B) a region in Mars beyond which liquid water exists as permafrost.
C) a boundary in the Solar System beyond which the water vapor could freeze.
D) the temperature at which the ice in the polar caps of Mars turns into liquid water.