Plate boundaries

Science

Definition

Plate boundaries are the edges where tectonic plates meet and interact. There are three main types: convergent (plates collide, forming mountains or subduction zones), divergent (plates move apart, creating new crust at mid-ocean ridges), and transform (plates slide past each other, causing earthquakes).

Examples

  • The San Andreas Fault as a transform boundary between the Pacific and North American plates
  • The Mid-Atlantic Ridge as a divergent boundary creating new ocean floor
  • The Mariana Trench forming at a convergent boundary where the Pacific plate subducts

Related Terms

Plate tectonics Tectonic plates Mountain formation Volcanic eruptions

Study This Concept

Practice plate boundaries with free review games in these units:

Earth Science Unit 2: Plate Tectonics and Earthquakes