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Collision plate boundary
Collision plates occur when two continental crust
plates meet. As they are the same density
neither is able to slide under the other one. so
fold mountains are created. Earthquakes are
common at collision plate boundaries.…read more

Slide 3

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Conservative plate boundaries
Conservative plate boundaries occur when two
plates pass along side each other. Quite often,
the two plates stick and pressure builds up; the
release of this pressure creates a severe
earthquake. There are no volcanic eruptions
along conservative plate margins because the
crust is neither being created nor destroyed.
The San Andreas Fault in California lies above
the North American and Pacific plates, and is an
example of a conservative plate margin.…read more

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Destructive plate
boundary
At a destructive margin an oceanic plate moves
towards a continental plate or another oceanic
plate. This is the subduction zone. As it is
forced downwards and this can result in violent
earthquakes. The heat produced by friction
turns the crust into magma. The magma tries to
rise to the surface and, if it succeeds, violent
volcanic eruptions can occur.…read more

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Constructive plate
boundaries
Constructive plate boundaries occur when two
plates move apart causing magma to rise up
and form new land as it cools. An example of
this is the Mid-Atlantic ridge which is moving
the USA away from Europe by 25 cm each year.…read more

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