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convection current
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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.
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convection current

heat transfer
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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.

Convection is a fundamental process of heat transfer where energy is moved by the circulation of a heated fluid, such as air or water. This movement occurs naturally as heated fluids expand, become less dense, and rise due to buoyancy, then cool, increase in density, and sink. This cycle creates convection currents, which are streams of fluid propelled by thermal convection.123

Examples include the uniform heating of air in a room or water in a kettle. Forced convection utilizes external means like fans or pumps to move fluids. In Earth's mantle, convection driven by radioactive decay is thought to be the primary force behind plate tectonics. Atmospheric convection currents, often caused by solar radiation, are responsible for phenomena like clouds and thunderstorms.14

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4 Britannica Sources
  1. convection
  2. plate tectonics - Mantle convection
  3. heat transfer
  4. convection current

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