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8-Sci - Unit3 L2-3

8-Sci-Unit3-Lessons2-3 Plate Tectonics

TermDefinition
continental drift the hypothesis that today's continents were once part of a single landmass.
plate tectonics theory that states Earth's surface is made up of giant moving slabs called tectonic plates.
theory explains HOW something happens in the natural world.
law explains WHAT happens in the natural world.
sea-floor spreading the process by which new sea floor is formed
subduction the process by which one tectonic plate is pulled beneath another plate
magnetic reversal a change of the magnetic poles on Earth
convection current any movement of matter that results in a difference of density
lithosphere outermost physical layer of Earth, a ridged solid layer made of rock
asthenosphere layer immediately below the lithosphere, solid layer of made of rock that is weak and flows slowly.
tectonic plates large moving pieces of lithosphere
compression a stress that squeezes or shortens material
tension a stress that lengthens or pulls a material apart
shear stress that causes material to twist or become distorted
convergent boundary boundary that is formed when tectonic plates move toward each other and collide
divergent boundary boundary that is formed when tectonic plates move away from each other
transform boundary boundary that is formed when tectonic plates move past one another in opposite directions
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