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Types of Plate Boundaries Geology 12 Types of Boundaries Convergent- area where opposing plates smash together: Ex.- west coast of North America Divergent- Area where plates are moving apart and spreading: Ex Mid-Atlantic rift Transform- area where two plates are sliding past one another in opposite directions: Ex- San Andreas Fault Divergent The lithosphere) is pulled apart, it typically breaks along parallel faults. The block between the faults cracks and drops down into the soft, plastic interior (the asthenosphere). The sinking of the block forms a central valley called a rift. Magma (liquid rock) seeps upward to fill the cracks. New crust is formed along the boundary. Earthquakes occur along the faults, and volcanoes form where the magma reaches the surface. Divergent Zones Convergent Boundary Collisions are very slow and last millions of years. The edge of the continental plate has folded into a huge mountain range The edge of the oceanic plate has bent downward and dug deep into the Earth and melts The melted rock rises up through the continental plate, causing more earthquakes and forming volcanic eruptions where it finally reaches the surface. An oceanic trench is a consistent feature. Most dangerous place to live Transform Boundaries Plates on either side of a transform boundary are merely sliding past each other and not tearing or crunching each other Transform boundaries lack the spectacular features found at convergent and divergent boundaries. Transform boundaries are marked in some places by linear valleys along the boundary where rock has been ground up by the sliding. Break-up of Pangaea- 210 million years ago *NS at one point had a transform fault and the province was splitting up. Cobiquid-Chedabucto Fault – N.S.