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Geologists have principally used which class of rocks to establish the relative time scale?

Wind moves from ___________ pressure areas to _____________ pressure areas.

Winter in the Southern Hemisphere begins at the __________.

Hardness is a comparative property that refers to the ability of a mineral to resist

The first 87% of geologic time is often called

That each successive layer of sediments is deposited on top of the previous layer, and hence is younger than the lower layer, is a statement of the

Metamorphism occurs for which class of rocks?

Which of the following radionuclides is used to date once-living material?

A possible explanation, or an educated guess, for why or how a natural phenomenon occurs is called a(n) __________.

Humans (the genus Homo) are believed by most geologists to have been around for only about __________ years of Earth’s history.