Here's a breakdown:
* Oceanic-Oceanic Convergence: When two oceanic plates collide, the denser plate subducts (sinks) beneath the less dense plate. This creates a deep trench in the ocean floor.
* Oceanic-Continental Convergence: When an oceanic plate collides with a continental plate, the denser oceanic plate subducts beneath the less dense continental plate. This also leads to the formation of a deep trench.
The process of subduction is what drives the formation of sea trenches. As the denser plate sinks, it melts in the Earth's mantle, generating magma that rises to the surface and can lead to the formation of volcanic arcs along the edge of the continent.
Examples of sea trenches formed at convergent boundaries:
* Mariana Trench: Formed by the subduction of the Pacific Plate beneath the Philippine Sea Plate.
* Peru-Chile Trench: Formed by the subduction of the Nazca Plate beneath the South American Plate.
* Japan Trench: Formed by the subduction of the Pacific Plate beneath the Eurasian Plate.
