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plate boundary
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Cross-sectional diagram showing three tectonic plates at ocean ridges, transform faults, and a subduction zone. The image illustrates rising magma forming rift and subduction volcanoes, convection currents in the mantle, and features such as ocean trenches, extinct and hot-spot volcanoes, and the movement of plates above a molten core and low-velocity mantle layer. Cross-sectional diagram illustrating plate tectonics, showing oceanic and continental crust moving over the asthenosphere. It highlights divergent boundaries at oceanic ridges where crust forms, convergent boundaries at trenches with subduction zones where crust is destroyed, and a transform boundary with a fault. Features such as island arcs, rising magma, and hotspots are labeled.
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plate boundary

geology
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Cross-sectional diagram showing three tectonic plates at ocean ridges, transform faults, and a subduction zone. The image illustrates rising magma forming rift and subduction volcanoes, convection currents in the mantle, and features such as ocean trenches, extinct and hot-spot volcanoes, and the movement of plates above a molten core and low-velocity mantle layer.
volcanism and plate tectonics Stratovolcanoes tend to form at subduction zones, or convergent plate margins, where an oceanic plate slides beneath a continental plate and contributes to the rise of magma to the surface. At rift zones, or divergent margins, shield volcanoes tend to form as two oceanic plates pull slowly apart and magma effuses upward through the gap. Volcanoes are not generally found at strike-slip zones, where two plates slide laterally past each other. “Hot spot” volcanoes may form where plumes of lava rise from deep within the mantle to Earth's crust far from any plate margins.

Plate boundaries are where Earth's lithospheric plates interact. These interactions shape the planet's surface through processes like earthquakes, volcanism, and mountain formation. There are three main types of plate boundaries:1

  • Divergent boundaries: Plates move apart, creating new crust as magma rises and cools. This can lead to continental rifting and the formation of rift valleys.2
  • Convergent boundaries: Plates collide. One plate may subduct beneath another, leading to volcanic arcs and island arcs. When two continental plates collide, they can form large mountain ranges.3
  • Transform faults: Plates slide past each other horizontally. These boundaries are characterized by shear and can cause significant earthquakes when stress is released.1

These plate movements are driven by forces within Earth's mantle, such as convection.1

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
4 Britannica Sources
  1. plate tectonics - Transform faults
  2. volcano - Rift volcanoes
  3. plate tectonics - Continental rifting
  4. plate tectonics - Island arcs

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