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Earth’s magnetic field is generated by the ________.

Olympus Mons, the largest known volcano in our Solar System, is found on ________.

Differentiation of the core from the mantle early in Earth’s history was possible because the planet was ________ at the time.

The slope of a stream surface measured between two points along its course is the ________.

By deep-sea drilling, the Glomar Challenger proved the theory that if the model of seafloor spreading was correct, then seafloor sediment should be ________ and ________ as one moves away from the spreading axis.

The elevation of the water table ________.

How are greenhouse gases like carbon dioxide and methane different from other atmospheric gases like nitrogen and oxygen?

Which list properly orders metamorphic rocks from lowest grade to highest grade?

Braided streams ________.

All else being equal, water will flow faster in a stream that has a ________, which is typically found near the river’s ________.