Subduction

Definition

Subduction is the process where one tectonic plate moves under another and sinks into the mantle. This typically occurs at convergent boundaries between oceanic and continental plates.

5 Must Know Facts For Your Next Test

1. Subduction zones are often associated with intense geological activity, including earthquakes and volcanic eruptions.
2. The subducting plate is usually an oceanic plate that sinks beneath a continental plate due to its higher density.
3. Subduction leads to the formation of deep ocean trenches, which are some of the deepest parts of the Earth's crust.
4. The process recycles oceanic crust back into the mantle, playing a crucial role in plate tectonics and the rock cycle.
5. Examples of subduction zones include the Pacific Ring of Fire and the Mariana Trench.

Review Questions

• What types of geological features are commonly found at subduction zones?
• Why does an oceanic plate typically subduct beneath a continental plate?
• How does subduction contribute to the recycling of Earth's crust?

Related terms

Tectonic Plates: Large pieces of Earth's lithosphere that move over the asthenosphere.

Convergent Boundary: A type of tectonic boundary where two plates move toward each other, often resulting in subduction.

Mantle:

The thick layer of rock between Earth's crust and core involved in tectonic activity.