Earth: An Introduction to Physical Geology (12th Edition)

Published by Pearson
ISBN 10: 0134074254
ISBN 13: 978-0-13407-425-2

Chapter 5 - Section 5.9 - plate Tectonics and Volcanic Activity - Concept Checks - Page 173: 2

Answer

Magma is generated along convergent plate boundaries through the process of subduction. As one tectonic plate subducts beneath another, it descends into the mantle, reaching depths where the temperature and pressure conditions cause the overlying rock to partially melt. This partial melting results in the formation of magma. The magma, being less dense than the surrounding rock, rises towards the surface, eventually leading to volcanic activity and the eruption of lava. The subduction of oceanic plates beneath continental plates or the collision of two continental plates are common scenarios where magma generation occurs along convergent plate boundaries.

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