Constructive plate boundary
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At a constructive plate boundary the north american plate (plate a) and the Eurasian plate (plate b) move apart.A constructive plate boundary, sometimes called a divergent plate margin, occurs when plates move apart. Volcanoes are formed as magma wells up to fill the gap, and eventually new crust is formed.
An example of a constructive plate boundary is the mid-Atlantic Ridge.
An example of a constructive plate boundary is the mid-Atlantic Ridge.
destructive plate boundary
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A destructive plate boundary is sometimes called a convergent or tensional plate margin. This occurs when oceanic and continental plates move together. The oceanic plate is forced under the lighter continental plate. Friction causes melting of the oceanic plate and may trigger earthquakes. Magma rises up through cracks and erupts onto the surface.
An example of a destructive plate boundary is where the Nazca plate is forced under the South American Plate.
An example of a destructive plate boundary is where the Nazca plate is forced under the South American Plate.
conservative plate boundary
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A conservative plate boundary, sometimes called a transform plate margin, occurs where plates slide past each other in opposite directions, or in the same direction but at different speeds.
Friction is eventually overcome and the plates slip past in a sudden movement. The shockwaves created produce an earthquake.
This occurs at the San Andreas Fault in California.
Friction is eventually overcome and the plates slip past in a sudden movement. The shockwaves created produce an earthquake.
This occurs at the San Andreas Fault in California.
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These occur when two plates are converging but are both continental plates. As continental plates cannot be destroyed, the land between the two plates is pushed upwards to form mountains such as the Himalayas. Only earthquakes take place here as there are no volcanoes.