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Earth Vocab

Murdock 6th grade HCMS 3/1/17 Vocab

TermDefinition
Continental crust thickest crust + less dense
Oceanic crust thin crust + more dense
Inner core an extremely hot, solid sphere of mostly iron and nickel at the center of the earth. About 750 miles in diameter. Very dense, and under a great amount of pressure
Outer core The only liquid layer of the earth, a sea of mostly iron and nickel. About 1400 miles thick and approximately 6000 º C
Mantle The largest layer of the earth is made of hot semi-solid rock. Approximately 1800 miles thick and located directly below the crust
Convection currents Magma heated by the core becomes HOT and rises. As it reaches the crust it cools slightly, becoming more dense and sinks back to the bottom/core. This circular motion is a convection current
Crust Hard and rigid rocky outermost layer. Only a few miles thin under oceans and up to 25 miles thick under continents. We live on top of the crust
Lithosphere The upper part of the mantle and the crust
Asthenosphere Middle mantle where convection currents occur
Popular Earth Science sets

 

 



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