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The current theory of the structure of the Earth, called plate tectonics, tells us that the continents are in constant motion.
Assume that the North American continent
can be represented by a slab of rock 5350 km
on a side and 25 km deep and that the rock
has an average mass density of 2990 kg/m .
The continent is moving at the rate of about
3.4 cm/year.

Sagot :

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