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Unit 1 Chapter 5

MMS Science 8-Plate Tectonics

One of the six or seven great divisions of land on the globe. Continent
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. Continental Drift
A large, ancient landmass that was composed of all the continents joined together. Pangaea
The portion of Earth's crust that lies beneath ocean waters. Seafloor
Hess's theory that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge. Seafloor Spreading
To come together. Converge
To move apart. Diverge
To convert or change. Transform
A theory that Earth's crust and upper mantle are broken into plates that float and move around on a plastic-like layer of the mantle. Plate Tectonics
A large section of Earth's oceanic or continental crust and rigid upper mantle that moves around on the asthenosphere. Plate
A rigid layer of Earth about 100 km thick, made of the crust and a part of the upper mantle. Lithosphere
A plastic-like layer of Earth on which the lithospheric plates float and move around. Asthenosphere
The current in Earth's mantle that transfers heat in Earth's interior and is the driving force for plate tectonics. Convection Current
Created by: rwaters