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ES Ch 10 Vocab

Glencoe Earth Science

AB
Wegner'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 positionsContinental drift
Large ancient landmass that was composed of all the continents joined togetherPangaea
Hess's theory that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridgeSeafloor spreading
Theory that Earth's crust and upper mantle are broken into plates that float and move around on a plasticlike layer of the mantlePlate tectonics
A large section of Earth's oceanic or continental crust and rigid upper mantle that moves around on the asthenospherePlate
Rigid layer of Earth about 100 km thick, made of the crust and a part of the upper mantleLithosphere
Plasticlike layer of Earth on which the lithospheric plates float and move aroundAsthenosphere
Current in Earth's mantle that transfers heat in Earth's interior and is the driving force for plate tectonicsConvection current


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