The outermost layer of the Earth, ranging from about 10-65km in thickness worldwide.
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Card 19
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Produces features such as composite volcanoes, fold mountains, deep sea trenches and island arcs e.g. the Caribbean.
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Card 20
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Volcano which is not active nor inert (sleeping).
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Card 21
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A vertical wall-like structure of igneous rock cutting across layers of rocks, where magma is forced up through vertical fissures.
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Card 22
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The location on the surface, directly above the focus.
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Card 23
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Old inert volcano.
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Card 24
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Magma which forces its way to the Earth's surface and erupts as lava, from volcanoes or fissures forming cones or plateaus. Also minor features such as geysers, hot springs and boiling mud pools.
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Card 25
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A fracture or zone of fractures in rock along which the two sides have been displaced relative to each other.
