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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 ____.​

Terrestrial planets are denser than the Jovian planets.

Swampy conditions during the Carboniferous lead to coal deposits forming throughout North America.

The Sierra Nevadas formed during what Cordilleran orogeny?

What is a mass extinction?

During the Paleozoic, three large mass extinctions took place. They occurred during the: