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8ES Chp 5:Changing E

8th Grade Earth Science Chapter 5: Changing Earth Leach

TermDefinition
nebular hypothesis The secular model for the origin of all stars and planetary systems throughout the universe; where a star system forms slowly from a cloud of gas and dust called a nebula.
stratum A rock layer in a sequence of strata.
geologic column The theoretical collection of rock layers in the order in which they formed.
principle of superposition The assumption that the layers of rock in any undisturbed sequence of strata contain the oldest stratum at the bottom with the younger or later layers placed in order above it.
diluvial geologic time scale A creation model of the earth's geologic history that classifies and arranges rocks in the sequence of their formation relative to the biblical flood.
tectonics The forces, energy, and processes that formed and reshaped the earth's continents, mountains, and ocean basins.
continental drift theory A model that explains the shape and arrangement of present continents and their features as the product of the slow motion of tectonic plates over millions of years.
magma Molten rock in the earth's interior.
sea-floor spreading The motion of oceanic tectonic plates away from the mid-ocean ridges where mantle rocks rise to form new ocean crust.
tectonic plate A section of the earth's crust that moves as a unit compared to other regions of crust.
subduction The tectonic process by which relatively thin and denser oceanic crust slowly slides down and under more massive but less dense continental crust.
catastrophic plate tectonics A model of the plate tectonics theory that proposes that the continents we see today formed during the one year period of the Flood.
Pangea The last of a series of supercontinents proposed by secular geologists that became the continents of today through continental drift.
Created by: CoachLeach
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