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Plate Tectonics Ch 4

Life on earth

Asthenosphere Plasticlike layer of Earth on which the lithospheric plates float and move around.
Continental drift Wegener's hypothesis that all continents were once connected in a single large landmass that broke apart about 200 million years ago and drifted slowly to their current positions.
Convection current Current in Earth's mantle that transfers heat in Earth's interior and is the driving force for plate tectonics.
Lithosphere Rigid layer of Earth about 100 km thick, made of the crust and a part of the upper mantle.
Pangaea Large, ancient landmass that was composed of all the continents joined together.
Plate A large section of Earth's oceanic or continental crust and rigid upper mantle that moves around on the asthenosphere.
Plate tectonics Theory that Earth's crust and upper mantle are broken into plates that float and move around on a plasticlike layer of the mantle.
Seafloor spreading Hess's theory that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge.
Created by: kyu