Tectonic Hazards - specialist terms

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Aftershock
smaller earthquakes that occur in he same general area during days or years following a larger event
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Convergent plate boundary
where plates collide with one another (oceanic plate +continental plate = subduction zone)
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Continental crust
composed of granite and is less dense (it does not sink and is permanent)
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Divergent plate boundary
where plates are moving apart
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Earthquake
a sudden violent shaking of the ground, typically causing great destruction, as a result of movements within the earth's crust or volcanic action.
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Epicentre
the point on the Earth's surface directly above the focus of an earthquake
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Fault
a fracture in the Earth's crust that shows signs of movement
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Focus
The point inside the crust where the pressure is released
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Geothermal
energy generated by heat stored deep in the earth
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GPS (Global Positioning System)
a group of satellites that allow people to find out their exact location on the Earth's surface
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Hot-spot volcanoes
Volcanoes related to a persistent heat source in the mantle.
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Lahar
a type of mudflow composed of pyroclastic material and water that flows down from a volcano (typically along a river valley)
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Lava
Magma which has reached the surface through a volcanic eruption.
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Liquifaction
the process of loose soil acting like a liquid during an earthquake.
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Magma
Molten rock beneath the surface of the earth.
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Mantle
The zone of the earth below the crust and above the core.
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Mid ocean ridge
any of several seismically active submarine mountain ranges that extend through the Atlantic, Indian, and South Pacific oceans
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Ocean trench
A deep, narrow trough in an ocean floor
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Oceanic crust
The earth's crust where it underlies oceans. Mainly made up of an igneous rock known as basalt. It is constantly being destroyed and replaced and can sink.
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Plate tectonics
the study of the distribution and movement of the Earth's crustal plates
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Pyroclastic flow
avalanches of hot volcanic debris
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Richter scale
a numerical scale for expressing the magnitude of an earthquake on the basis of seismograph oscillations.
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Seismic waves
vibrations generated by an earthquake
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Seismometer
An instrument that measures motion of the ground caused by earthquake waves.
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Shield volcano
volcano that covers large area with gently sloping sides
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Strato volcano
tall, conical volcano composed of many layers
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Subduction zone
the area of destructive plate boundary where one plate descends beneath another
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Transform plate boundary
where plates slide past each other
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Tsunami
tidal wave caused by an underwater earthquake
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Weathering
breaking up of rock by the action of weathering, plants, animals and chemical processes
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Other cards in this set

Card 2

Front

where plates collide with one another (oceanic plate +continental plate = subduction zone)

Back

Convergent plate boundary

Card 3

Front

composed of granite and is less dense (it does not sink and is permanent)

Back

Preview of the back of card 3

Card 4

Front

where plates are moving apart

Back

Preview of the back of card 4

Card 5

Front

a sudden violent shaking of the ground, typically causing great destruction, as a result of movements within the earth's crust or volcanic action.

Back

Preview of the back of card 5
View more cards

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