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Plate boundary

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Further information: Plate tectonics
Three types of plate boundary.

The major types of plate boundaries are:

  1. Spreading boundaries. Mid-Atlantic Ridge and Africa's Great Rift Valley are examples. Rift valleys, mountains (orogeny), volcanoes.
  2. Collision boundaries. These collide, forming a subduction zone (Wast coast of the Americas) or a continental collision (India with Asia). Mountains (orogeny), valleys, volcanoes.
  3. Transform or fault boundaries. Here plates gring past each other along transform faults. Earthquakes, volcanoes,
  4. Conservative boundaries: little or no relative motion

All boundaries except the conservative ones are sites of major geological activity.

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