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The distribution of ________ across the globe provides the primary indicator of boundaries between all tectonic plates.

The distinction between the crust and the mantle is primarily on the basis of a difference in ________; the distinction between the lithosphere and the asthenosphere is primarily on the basis of a difference in ________.

A fracture in the crust, where rocks slide past one another, is termed a ________.

Thermohaline circulation carries ________ water from the poles to the equator, where the water becomes ________.

In the figure below, which letters represent the crest and trough?

Saline ocean water is ________ dense than fresh water and provides ________ buoyancy to objects floating in it.

Cleavage in minerals refers to ________.

The primary stream fed by tributaries within a dendritic drainage network is termed a ________ stream.

In ancient Greece, Eratosthenes measured the difference in angles of the Sun’s rays in two different locations in Egypt at the same time to calculate the ________.

In the heliocentric model ________.