This is a picture of a geologist examining the eruptive hsitory of a volcano.
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Image from: U.S. Geological Survey, photo by Robert McGimsey
An examination of consecutive lava flows of a volcano reveals the chemical evolution of the magma in the chamber.
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As the Earth cools, hot material from the deep interior rises to the surface. Hot material is depicted in red in this drawing, under an ocean shown in blue green. The hotter material elevates the nearby...more