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Plate Tectonics

Plate tectonics is the scientific theory that describes Earth's outer shell as divided into several large, slowly moving rigid plates whose interactions drive earthquakes, volcanism, and the formation of mountains and ocean basins.

Overview

Earth's lithosphere is divided into major and minor plates that float on the viscous asthenosphere and move a few centimeters per year driven by mantle convection. At divergent boundaries, plates separate and new oceanic crust forms. At convergent boundaries, one plate can subduct beneath another, building volcanic arcs and mountain ranges. At transform boundaries, plates slide past each other generating earthquakes. The discovery of seafloor spreading and the confirmation of magnetic striping patterns on the ocean floor provided the critical evidence that cemented plate tectonics as the unifying framework of geology in the twentieth century.

Why it matters

Plate tectonics transformed Earth science by providing a single unifying explanation for the distribution of earthquakes and volcanoes, the shapes of continents, the origin of mountain belts, and the evolution of ocean basins. It fundamentally changed how geologists understand Earth's history over billions of years and has critical practical applications in predicting seismic and volcanic hazards. It also reshaped understanding of how life evolved by explaining continental drift and the isolation and reconnection of biological communities.

What it builds on

• Geomorphology
• Ecology

Related concepts

• PhysicslogicalPlate tectonics applies principles of fluid dynamics, heat transfer, and mechanics to the slow motion of rigid crustal plates over Earth's mantle.
• ChemistryconceptualVolcanic outgassing and hydrothermal vent chemistry driven by tectonic activity have shaped Earth's atmosphere, oceans, and geochemical cycles.
• HistoryappliedHuman civilizations have been shaped by volcanic eruptions, earthquakes, and the geographic configurations created by plate tectonics.
• Natural SelectionconceptualContinental drift creates and destroys biological corridors, generating the geographic isolation that drives speciation through natural selection.