flash cards

GEOGRAPHY NOTES

Term Definition
CRUST MADE UP OF SOLID ROCK. TWO MAIN TYPES, OCEANIC CRUST AND CONTINENTAL.
MANTLE MADE UP OF ROCK. MOLTEN OR SEMI-MOLTEN STATE.
OUTER CORE MADE UP MAINLY OF IRON. MOLTEN/LIQUID STATE.
INNER CORE MADE UP MAINLY OF IRON AND NICKEL. SOLD STATE. VERY HIGH TEMPERATURES (UP TO 5000c)
THE MOHO THE BOUNDARY BETWEEN THE EARTHS CRUST AND THE MANTLE.
CONTINENTAL CRUST COMPOSED OF LIGHT ROCKS MADE FROM SILICA AND ALUMINA (SIAL) 30-70KM THICK.
OCEANIC CRUST COMPOSED OF HEAVY ROCKS MADE FROM SILICA AND MAGNESIUM (SIMA) 3-10KM THICK.
THE LITHOSPHERE TERM USED TO DESCRIBE THE EARTHS CRUST AND THE SOLID UPPER MANTLE TO LITHIFY MEANS TO TURN TO ROCK.
ASTENOSPHERE CARRIES THE LITHOSPHERE OF THE EARTH, INCLUDING THE CONTINENTS.
DIVERGING MEANS MOVING IN DIFFERENT DIRECTIONS FROM ONE POINT.
CONVERGING MEANS COMING TOGETHER FROM DIFFERENT DIRECTIONS TO MEET AT ONE POINT.
GLACIATIONS REFERS TO A PERIOD WHEN THE EARTH ISS COVERED WITH GLACIERS OR ICE.
MID-OCEAN RIDGE IS MADE UP OF UNDERWATER MOUNTAIN RIDGES.
SUBDUCTION OCCURS WHEN A HEAVIER PLATE SINKS AND BENDS BENEATH A LIGHTER PLATE.
SUBDUCTION ZONE IS THE POINT WHERE AN OCEANIC PLATE SLIDES BENEATH EITHER A CONTINENTAL PLATE OR ANOTHER OCEANIC PLATE.

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