Magma is a hot, molten rock that forms beneath the Earth's surface. It can erupt through a volcano and becomes lava when it reaches the surface. Full definition
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Sentences with «magma»
The material, they believe, was recycled as older volcanic rocks forming the roofs of magma chambers collapsed and remelted during eruptions, only to be reejected in the next volcanic outburst. (sciencemag.org)
Steffi and her colleagues have now managed to show how the popcorn - effect makes the rock fragments float and rise to the top of magma chambers rather than sink to the bottom. (sciencedaily.com)
Perhaps the rise in magma from deeper regions merely slowed during the last 2.9 million years, forming an enormous body of rock known as a pluton. (sciencedaily.com)