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Structure of the Earth…read more

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Tectonics
The Earth's crust consists of Tectonic Plates
Heat rising and falling inside the mantle creates convection
currents, generated by radioactive decay in the core.
The convection currents move the plates.
Where convection currents diverge near the Earth's crust,
plates move apart.
Where convection currents converge, plates move towards
each other.
The movement of the plates, and the activity inside the
Earth, is called plate tectonics.…read more

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At a tensional, constructive or divergent boundary
the plates move apart.
At a compressional, destructive or convergent
boundary the plates move towards each other.
At a conservative or transform boundary the plates
slide past each other.…read more

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Constructive
At a constructive boundary the plates are moving apart.
E.g The Helgafjell volcano on Westman Island, Iceland
As the plates move apart, magma rises from the mantle. The
magma erupts to the surface of the Earth. Earthquakes
occur.
When the magma reaches the surface, it cools and solidifies
to form a new crust of igneous rock. This process is
repeated many times, over a long period of time.
Eventually the new rock builds up to form a volcano.
Constructive boundaries tend to be found under the sea,
e.g. the Mid Atlantic Ridge.…read more

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constructive
Earthquakes: Yes
Oceanic:
Continental:…read more

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