Most of the land is in the Northern Hemisphere by
luck. The continents are in motion on the surface
of the Earth in a process called tectonics. The
continents are part of tectonic plates, which are
pieces of the Earth's outer shell that sometimes
move away from each other and sometimes crash into
each other. At several times in the past, most of
the continental crust was attached. As they moved
around, the continents broke apart from each
other. What we now have in the Northern
Hemisphere is a result of these tectonic motions.
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