Science Olympiad Dynamic Planet Practice Test

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What does slab/trench suction refer to in tectonic activity?

  1. The attraction of plates due to magnetic fields

  2. Flow in the mantle induced by subducting slabs

  3. The pushing of plates away from ocean ridges

  4. The vertical movement of the lithosphere

The correct answer is: Flow in the mantle induced by subducting slabs

Slab/trench suction refers to the flow in the mantle that is induced by subducting slabs. This process occurs at convergent plate boundaries where one tectonic plate is forced down into the mantle beneath another plate. As the denser oceanic plate subducts, it creates a trench at the ocean floor and exerts a downward pull on the surrounding mantle. This downward motion generates a suction effect that can influence the flow of the mantle material around the slab. This mantle flow can help to drive the motion of adjacent tectonic plates. It plays a significant role in the mechanism of plate tectonics by contributing to the overall dynamics of plate movement and the recycling of material in the Earth's interior. Understanding this concept is essential for grasping how subduction zones operate and their effects on geological processes such as earthquakes and volcanic activity.

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