The Earth's rocky outer crust solidified billions of
years ago, soon after the Earth formed. This crust is not a solid
shell; it is broken up into huge, thick plates that drift atop the soft,
underlying mantle.
The plates are made of rock and drift all over the globe; they move both
horizontally (sideways) and vertically (up and down). Over long
periods of time, the plates also change in size as their margins are
added to, crushed together, or pushed back into the Earth's mantle. These plates are from 50 to 250 miles (80 to 400 km) thick.
Cold air is correct answer
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Answer:
Because of the influence of colonial rule. There is also another reason: to unify all languages.
True. A theory arises from certain phenomena or scenarios out of observation in an effort to explain why they occur, though they are yet to be proven.