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The circumference of Earth is most nearly ________.

Plutons and batholiths are ________.

Broadly, metamorphism involves ________.

As a rule, groundwater always flows from areas of ________.

Of the three primary forms of subaerial volcanoes, ________ are typically the largest in area.

The silica tetrahedron that forms the backbone of all the silicate minerals is composed of silicon and what other element?

The theory of plate tectonics ________.

It is unusual for ________ to carry grains larger than sand.

In general, when rock is partially melted, the chemistry of the melt is ________.

________ is an example of a continental rift and the ________ is/are the result of collision.