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McC 8 Plate Tectonic

Plate tectonics

continental drift the theory that the continents have drifted slowly over time to their current locations.
Pangaea the giant landmass of 200 million years ago that broke apart; meaning all land
sea floor spreading the 1960 theory of Harry Hess, proposing that hot, less dense material below the earth's crust rises up to th surface at mid-ocean ridges.
plate tectonics theory that staes the Earth's crust and part of the upper mantleare broken into sections.
plate these move on a plastic-like layer of the mantle
lithosphere the crust and the upper mantle
asthenosphere plastic-like layer below the lithosphere
convection current a cycle of heating, rising and cooling within the Earth's interior
earthquake the product of tremendous energy released as rocks break and move apart
fault the surface where a break in rock has occured
seismic wave waves transmitted through the Earth's materials and along it's surface
focus the point inside the Earth where movement first occurs and the energy is released
seismograph an instrument used to record the seismic waves of an earthquake
magnitude the height of lines on a seisomograph; a measure of the energy released by an earthquake.
tsunamis an earthquake that begins on an ocean floor, causing powerful water waves to be produced
seismic safe a building will have this certification if it will stand up to against the vibrations caused by earthquakes
volcanoes rising magma that leads to an eruption, where magma, solids, and gases are spwed from the top.
lava magma as it flows to the top of the earth's surface.
shield volcano broad volcano with gently sloping sides
cinder cone volcano top less than 300 m and forms in groups near other volcanoes
composite volcano steep-sided mountains composed of layers lava and tephra
tephra solidified lava, ash, and cinders
rift long cracks that form between plate boundaries as they separate
hot spot large, hot, rising bodies of magma that rise through the arth's crust and mantle
convergent boundary a place where tectonic plates move towards one another
divergent boundary a place where tectonic plates move away from each other
transform boundary a place where tectonic plates grind past one another
Created by: aberndt