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"MOLTEN ROCK MAY ERUPT onto Earth’s surface at a volcano, or it
may solidify underground. Igneous rocks form some very distinctive
landscapes, such as huge gray mountains, precipitous volcanic
buttes, and menacing cone-shaped volcanoes. How does molten rock
form, move, and solidify, and what types of landscapes and other
features does it produce? "
From: Exploring Geology
by Stephen Reynolds, et al