Tectonic plates

Science

Definition

Large slabs of Earth's lithosphere that float on the semi-fluid asthenosphere and move slowly over time. Their interactions at boundaries cause earthquakes, volcanic eruptions, and mountain formation. There are about 15 major plates covering Earth's surface.

Examples

  • The Pacific Plate moving northwest past the North American Plate along the San Andreas Fault
  • The Indian Plate colliding with the Eurasian Plate to form the Himalayan mountain range
  • The Nazca Plate subducting under the South American Plate, creating the Andes Mountains

Related Terms

Plate tectonics Plate boundaries Earthquake waves Volcanic eruptions

Study This Concept

Practice tectonic plates with free review games in these units:

Earth Science Unit 2: Plate Tectonics and Earthquakes