Friday, March 2, 2012

Volcanoes and Batholiths

Photo credits: top-Davis Spier, Earth Science World; bottom-R. Clucas, AK Volcano Observatory.

Let's look take a look at each of the above pictures.
The top picture of Mount Rushmore in the Black Hills of South Dakota is the result of an igneous feature called a batholith. A batholith is a very large igneous intrusion and these batholiths are associated with many of the major mountain ranges.

The middle picture of Crater Lake in Oregon was produced when the summit of a volcano collapsed. This depression is also known as a caldera.

The bottom picture is of Redoubt Volcano in Alaska. Redoubt Volcano is located on the Ring of Fire- a belt of volcanoes which surrounds most of the Pacific Ocean. Redoubt Volcano is known as a composite/stratovolcano . This type of volcano produces the most violent of volcanic eruptions.

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