What do we mean when we say that the terrestrial worlds underwent differentiation?
A) When their interiors were molten, denser materials sank toward their centers and lighter materials rose toward their surfaces.
B) The five terrestrial worlds all started similarly but ended up looking quite different.
C) Their surfaces show a variety of different geological features resulting from different geological processes.
D) They lost interior heat to outer space.
Question 2
The light radiated from the Sun's surface reaches Earth in about 8 minutes, but the energy of that light was released by fusion in the solar core about
A) a hundred years ago.
B) a thousand years ago.
C) tens of thousands of years ago.
D) hundreds of thousands of years ago.
E) a million years ago.
The 15 terrestrial ecozones in Canada.
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