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Tectonic plates
- The Earth's surface is separated into tectonic plates
- There are three types of
plates margins
- Destructive margins : are where two plates are moving
towards each other, e.g along the east coast of japan. Where
an oceanic plate meets a continental plate, the denser oceanic
plate is forced down into the mantle and destroyed. This often
creates Volcanoes and ocean trenches. Where two continental
plates meet, the plates smash together, but no crust is
destroyed
- Constructive margins are where two plates are moving away from each
other, e.g at the mid-atlantic ridge. Magma rises from the mantle to fill the gap
and cools, creating new crust
- Conservative margins are where two plates are moving sideways past each other, or
are moving in the same directionbut at different speeds, e.g along the west coast of
the USA. Crust isnt created of destroyed.
- Destructive margins : are where two plates are moving
towards each other, e.g along the east coast of japan. Where
an oceanic plate meets a continental plate, the denser oceanic
plate is forced down into the mantle and destroyed. This often
creates Volcanoes and ocean trenches. Where two continental
plates meet, the plates smash together, but no crust is
destroyed
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