At convergent plate boundaries, tectonic plates move toward each other, and one or both plates are forced downward, crumpled, or uplifted, depending on the type of crust involved.

Quick Scoop

1. Basic motion at convergent boundaries

  • The plates move directly toward each other.
  • The boundary is a ā€œcollision zoneā€ where crust is destroyed or recycled back into the mantle.

2. Three main convergent scenarios

  1. Oceanicā€“continental convergence
    • The denser oceanic plate dives beneath the lighter continental plate (this is called subduction).
    • This creates a deep ocean trench offshore and a chain of volcanoes and mountains on the continent (like the Andes).
  2. Oceanicā€“oceanic convergence
    • One oceanic plate subducts beneath the other, forming an ocean trench and a curved line of volcanic islands (an island arc, like the Aleutians).
  3. Continentalā€“continental convergence
    • Both plates are buoyant continental crust, so neither subducts easily.
    • Instead, the crust crumples, thickens, and is pushed upward to form huge mountain ranges (like the Himalayas).

3. Simple way to picture it

  • Imagine two slow conveyor belts running into each other: where they meet, one belt may dive under the other, or they may jam and wrinkle upward into a ā€œridgeā€ of piled-up material.

4. One-sentence answer for class

At convergent plate boundaries, plates move toward each other, and one plate usually subducts beneath the other, or both buckle upward to form large mountain ranges.

TL;DR: They move toward each other, causing subduction or collision that destroys or thickens crust.