Granite, Carboniferous Limestone, Chalk And Clay
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Wednesday 17 September 2008
Definitions
volcano - a cone shaped hill through which lava, ashes and gases may erupt (Phases: active, dormant, extinct)
vent - central pipe through which magma rises in the volcano
crater - surface rim of the volcano
magma - molten rock below the Earth's surface
lava - molten rock above the Earth's surface 700 -1200 degrees C
secondary cone - a smaller cone found on the side of the main volcanic cone, fed by small pipes branching from the vent or directly from the magma chamber
ash- volcanic rock dust less than 4mm in size
nuee ardente - a cloud of volcanic ash and pyroclasts
magma chamber - a body of molten rock found at the base of the vent
sill - a horizontal igneous intrusion
dyke - a vertical igneous intrusion
Pyroclastic - broken up rocks, volcanic fragments thrown up in an eruption (fire fragments)
Volcaninc bombs - a mass of ejected lava from a volcanic. A rugby ball shaped mass of molten rock larger than 65 mm
People adapting to living in fold mountain areas
People Adapting To The Landforms
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Friday 12 September 2008
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