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Plate Tectonics

QuestionAnswer
seismic waves Vibrations that travel through Earth carrying the energy released during an earthquake.
pressure the force pressing on an area
crust The layer of rock that forms Earth's outer skin
mantle the layer below the crust-made of hot rock
lithosphere the uppermost part of the mantle and the crust
asthenosphere The soft layer of the mantle underneath the lithosphere. It can bend like plastic.
outer core A layer of molten metal that surrounds the inner core.
inner core a dense ball of solid metal.
radiation the transfer of energy through space
conduction Heat transfer within a material or between materials that are touching.
convection Heat transferred by movement within fluids
density a measure of how much mass there is in a volume of a substance
convection current the flow that transfers heat within a fluid
continental drift Wegener's theory that the continents slowly moved over Earth's surface.
Pangaea Landmass that broke apart 200 million years ago and created today's continents.
fossil any trace of an ancient organism that has been preserved in rock
mid-ocean ridge an undersea mountain chain
sea-floor spreading The sea floor spreads apard along both sides of a mid-ocean ridge as new crust is added.
subduction The process where the ocean floor sinks beneath a deep-ocean trench and back into the mantle.
plates The cracks in the continents break the lithosphere into separate sections.
plate tectonics The theory that states that pieces of Earth's lithosphere are in slow, constant motion, driven by convection currents in the mantle.
faults breaks in Earth's crust where rocks have slipped past each other.
spreading boundary where two plates move apart (usually along mid-ocean ridges)
rift valley A spreading that occurs on land, when 2 of Earth's plates slide apart.
colliding boundaries The place where 2 plates come together, or collide.
sliding boundary A place where 2 plates slip past each other, moving in opposite directions.
Created by: mrsthomsen
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