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  • Understanding Subduction: How Earth's Crust Returns to the Mantle
    The process of where crust goes back down into the Earth is called subduction.

    Here's a breakdown of the process:

    * Plate Tectonics: The Earth's outer layer, the lithosphere, is made up of large, moving plates called tectonic plates.

    * Convergent Boundaries: When two tectonic plates collide, one denser plate will be forced beneath the other.

    * Subduction Zone: The area where one plate slides beneath another is called a subduction zone.

    * Melting and Magma: As the subducted plate descends, it heats up due to friction and pressure. This can cause the rocks to melt, creating magma.

    * Volcanoes and Earthquakes: The magma can rise to the surface, leading to volcanic eruptions. The movement of the plates along the subduction zone also causes earthquakes.

    Key Points:

    * Subduction is a key process in plate tectonics, shaping the Earth's surface and contributing to volcanic activity and earthquakes.

    * The denser plate is typically oceanic crust, which is subducted beneath the less dense continental crust.

    * The process of subduction is a continuous cycle, where old crust is recycled back into the mantle.

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