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sw-The dynamic crust

Earthquakes,Volcanoes and plate tectonics

Earthquake Any shaking or rapid motion of Earth's solid outer layers
Fault a zone of weakness or a crack where previous motion occured.
Focus the place underground where the break first occurs
Epicenter the location at the Earth's surface just above the focus
Seismometer an instument that detects vibrations of the ground
P-waves *travel faster than s-waves *"p" stands for primary/push-pull(describes the ground's movement * pass through liquid
S-waves * "s" stands for secondary or side-side(ground movement *motion is like traveling down a rope *pass through solids
crust outermost layer of our planet
Moho/Mohorovicic discontinuity the layer of earth were earthquake waves suddenly get faster
refraction bending of the waves
shadow zone a ring shaped region caused by bending of the waves at the mantle-core boundary
Ring of Fire A ring of the most # of volcanoes and seismic events around the edges of the Pacific Ocean
tsunami A big wave usually caused by a earthquake or landslide under water
Alfred Wegener The scientist who came up with the theory of continental drift
Continental Drift the theory that all the continents fit together and eventually broke into continents
Pangea "the super continent",or when all continents were together
Convergent boundary colliding plates
Divergent boundary separating plates
subduction zone when a oceanic plate dives underneath a continental plate
trenches linear troughs caused by subduction zones
island arcs island groups caused by rising magma plumes from decending plates
Transform boundary where plates slide past each other
mid ocean ridges where upwelling magma creates new crust that moves away from the ridge in both directions
rift zone also known as a divergent plate boundary
conduction allows energy to flow through solids,very slow process
convection distibutes heat through solids
hot spot when a lithospheric plate moves over a source of magma,to form volcanoes
Created by: SaraW on 2007-12-13

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