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PCS Earth Science

chapter 17

TermDefinition
continental drift hypothesis that earth's continents were once joined as a single land mass
pangaea name for Wegener's super continent
magnetometer used to study the ocean floor, it detects magnetic fields.
paleomagnetism study of magnetic record provided by rocks containing iron-bearing materials
magnetic reversal change in Earth's magnetic field
isochron line on a map that connects points of equal age
seafloor spreading new oceanic crust is formed at ocean ridges and destroyed at deep-sea trenches
theory of plate tectonics Earth's crust and rigid upper mantle are broken up into enormous slabs called plates
divergent boundary places where 2 tectonic plates move away from each other
rift valley long narrow depression in the continental crust
convergent boundary where 2 tectonic plates move towards one another.
subduction one plate is pushed under the other....continental over oceanic
transform boundary where 2 plates slide past each other horizontally deforming the crust and fracturing it.
ridge push pushes the plates toward the subduction zone
slab pull the weight of the subducting plate pulling it into the subduction zone
convection pull the plates downward
Created by: cboula
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