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8th Science U7 L1

Hypothesis that a single large landmass broke up into smaller land masses to form new continents,which then drafted to the present location; the movement of continents continental drift
The process by which Earth's magnetic north pole and magnetic south pole switch positions periodically; a change in the direction in which Earth's magnetic field points magnetic reversals
The theory that Earth's outer layer is made up of large, moving pieces called tonic plates; The theory explain how the plates interact and how those interactions relate to processes such as earthquakes in mountain building plate tectonics
A system of ideas that explains many related observations and is supported by a large body of evidence acquired Scientific investigation. theory
The process by which new oceanic lithosphere ( sea floor) forms when the magma rises to Earth's surface at mid-ocean ridges and solidifies, as older, existing seafloor moves away from the ridge. sea-floor spreading
The process by which one lithospheric plate moves beneath another plate as a result of tectonic forces. subduction
A block of lithosphere that consists of the crust and the rigid, outermost part of the mantle. tectonic plates
The solid outer layer of Earth that consists of the crust and the rigid upper part of the mantle. lithosphere
The soft layer of the mantle on which the tectonic plates move. asthenosphere
a long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading. mid-ocean ridge
Created by: ashaver