World Geography
Who was first to measure the circumference of Earth?

Aristotle
Eratosthenes
Anaximander
Herodotus

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World Geography
The modern theory of plate tectonics states

All of these
the creation of oceanic crust and the drifting of continents
that the oceanic crust is destroyed at areas where this crust type becomes subducted under the light
the convention currents within the earth's mantle cause the creation of new oceanic crust at the mid

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