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