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The two types of Earth’s crust are continental and lithospheric.

The fossil record shows significant changes in the diversity of organisms through time.

Any vertebrate (such as amphibians and reptiles) that depends on external heat to regulate body temperature is said to be ____.​

From the oldest to the youngest, what are the three phases of the Cordilleran orogeny?

Most of the organisms that have ever existed are now extinct.

Cratons have two components. The ________is made up of exposed basement rocks.

What type of ore deposits formed along the western United States during the Mesozoic period?

What is an epeiric sea?

Evaporite deposition was caused by the presence and closure of _________ around depositional basins.

Atoms of the same element with different numbers of neutrons in the nuclei are known as ____.​