What role do subduction zones play in the rock cycle?

What role do subduction zones play in the rock cycle?

• A. They help in the formation of new land.
• B. They recycle crustal material back into the mantle.
• C. They create ocean currents.
• D. They prevent the sinking of tectonic plates.

Answer: (B)

Subduction zones are critical in the rock cycle primarily because they recycle crustal material back into the mantle. These zones occur where one tectonic plate is forced beneath another into the Earth's mantle, a process known as subduction. As the oceanic plate descends, it carries with it sediments, water, and other materials from the surface. This not only contributes to the melting of the subducting plate, leading to the formation of magma, but also facilitates the transformation of materials, which can eventually rise again to form new rocky formations. This recycling of material is essential for maintaining geological processes and contributes to the continuous cycle of rock formation, erosion, and destruction. The movement at subduction zones can lead to volcanic activity and the creation of new landforms, but their primary role in the context of recycling materials into the mantle is what makes them a vital aspect of the rock cycle.

Subduction zones are critical in the rock cycle primarily because they recycle crustal material back into the mantle. These zones occur where one tectonic plate is forced beneath another into the Earth's mantle, a process known as subduction. As the oceanic plate descends, it carries with it sediments, water, and other materials from the surface. This not only contributes to the melting of the subducting plate, leading to the formation of magma, but also facilitates the transformation of materials, which can eventually rise again to form new rocky formations.

This recycling of material is essential for maintaining geological processes and contributes to the continuous cycle of rock formation, erosion, and destruction. The movement at subduction zones can lead to volcanic activity and the creation of new landforms, but their primary role in the context of recycling materials into the mantle is what makes them a vital aspect of the rock cycle.