True or False: The most distinctive chemical and physical boundary within Earth is between the mantle and core.
Indicate whether this statement is true or false.
Question 2
Although spectacular collisions like comet Shoemaker-Levy 9 impact with Jupiter in 1994 provide evidence that planetary accretion is still occurring, near all the mass of the solar nebula now resides in the sun and planets.
When did Earth, for the most part, attain its current mass and volume?
A) 65 million years ago
B) 12,000 years ago
C) it hasn't
D) 4,500 million years ago
Sunlight on Mars is dimmer than on Earth. This photo of a Martian sunset was imaged by Mars Pathfind
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