Answer: They are separated by the thin wedge of the Canadian Shield that extends through the St Lawrence river to the Atlantic Ocean.
Explanation:
Lava cools more rapidly above ground than it does underground because it's much colder above ground than it is underground, speeding up the process.
Think about it this way: If you put a cup of water in two freezers, and Freezer A had a lower temperature than Freezer B, the water in Freezer A would freeze quicker because it is in a colder environment. Hope this helps!
As a result, craters would be more widespread on the Martian surface. This is because there is less atmosphere from less outgassing, it is likely that erosion would be less important as well resulting into craters being widespread on Martian surface.
If Mars were smaller, it would have undergone less volcanic and tectonic activity because its interior would have cooled more.
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The cause
is the relative motion of the tectonic plates. The India plate is
moving northward, scrunching into the Eurasia
plate. Along the line where
they meet, the material is getting pushed
up and wrinkled.
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