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Chapter 4

TermDefinition
core Earth's center, where pressures and temperatures are very high
mantle The section of Earth's interior that lies above the outer core and has the most mass
magma Liquid rock within Earth
plate tectonics The theory Earth's crust is divided into rigid plates that slowly move across the upper mantle
continental drift The process by which Earth's plates slowly move across the upper mantle
rift valleys Places on Earth's surface where the crust stretches until it breaks
abyssal plains Areas of the ocean floor where rocks gradually sink because they have no supporting heat below them; the world's flattest and smoothest regions
continental shelves Areas where continental surfaces extend under the shallow ocean water around the continents
trench A deep valley marking a collision of plates, where one plate slide under another
folds Places where rocks have been compressed into bends by colliding areas
faults Places where rock masses have been broken apart and moving away from each other
weathering The process by which rocks break and decay over time
sediment Small particles of weathered rock
erosion Movement of surface material from one location to another by water, wind, and ice
glaciers Thick masses of ice, including great ice sheets and bodies of ice that flow down mountains like slow rivers
plateau An elevated flatland that rises sharply above nearby land on at least one side
alluvial fan Fan-shaped deposit of mud and gravel often found along the bases of mountains
delta Accumulation of sediment at the mouth of a river
Created by: chritarver
Popular Geography sets

 

 



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