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吉林大学:《地球科学概论》课程PPT教学课件(英文版)Chapter 5:Magma And Volcanoes

Introduction: Earth's' Internal-- Thermal Engine Magma is molten rock beneath Earth's surface. Because liquid magma is less dense than surrounding solid rock, and obviously more mobile, magma, once formed, rises toward the surface. Magma that reaches the surface does so by erupting through vents we call volcanoes.
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