GCSE Tectonics

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  • Created on: 11-05-13 10:49
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Geography Summary!
The Plate Boundaries:
You should know about a collision plate boundary, but you only need to know that they are two pieces
of continental crust moving towards each other which get forced upwards fold mountains and
earthquakes e.g. Himalayan mountain range
Earthquakes are found in long, narrow belts, they follow the plate boundaries. There are earthquakes
on the west coast of North and South America, round the edge of the pacific ocean, following the
MidAtlantic Ridge and down the middle of the ocean.
Volcanoes occur in narrow belts or small clumps (hotspots). There is a clump (hotspot) on the
Hawaiian islands, as well as round the Pacific ocean ("Ring of Fire") and near the Indonesian islands.

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There are some on the West coast of North and South America as well as the Mediterranean sea,
centred Italy.
A volcano is a crack/fissure in the crust of the Earth, through which molten rock (lava) and volcanic
gases can escape from during an eruption. However, there is more than one type of volcano:
Shield ­ A volcano formed at a constructive plate boundary that has gently sloping sides made of lava.…read more

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Volcanic gases Gases such as F2, H2S, water vapour, CO2 etc,
can leak from a volcano and some are harmful.
Tephra The generic name for all volcanic rock,
regardless of size. This can be 0.0002mm to 1m
in diameter. Larger tephra can be described as a
volcanic bomb.
Landslide A massive failure in the structure of the volcano
which moves rapidly downhill, usually triggered
by an earthquake.…read more


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