Ana chapter 10
Terms
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- continental drift
- Wegener's hypothesis that all continents were once connected in a single, large landmass
- Pangaea
- large, ancient landmass that was composed of all the continents joined together
- sea floor spreading
- Hess's theory that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge
- plate tectonics
- theory that Earth's crust and upper mantle are broken into plates that float and move around
- plate
- a large section of Earth's oceanic or continental crust and rigid upper mantle that moves around on the asthenosphere
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lithosphere
litho-earth
sphere-round - rigid layer of Earth about 100 km thick, made of the crust and a part of the upper mantle
- asthenosphere
- plasticlike layer of Earth on which the lithospheric plates float and move around
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convection current
convection deals with heat - current in Earth's mantle that transfers heat in Earth's interior and is the driving force for plate tectonics
- Alfred Wegener
- Pangaea
- Wegener's idea
- of continental drift
- mapping of the ocean floor in the 1950s showed
- underwater mountains and rift valleys
- Harry Hess
- suggested seafloor spreading
- How is magnetic evidence preserved in rocks forming along a mid-ocean ridge
- do you know this?
- magnetic evidence
- theory of seafloor spreading is supported by magnetic evidence in rocks
- convection currents
- move plates
- How do converging plates form mountains?
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converge means come together, they overlap and form mountains
diverge means split apart (trench)