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EARTH SCIENCE CHAPTER 6 – SECT. 1 LANDFORMS
PLAINS
 COASTAL PLAINS – LOWLANDS; EXPOSED
PORTION OF CONTINENTAL SHELF THAT EXTENDS
INTO THE OCEAN
o EXAMPLES – ATLANTIC COASTAL PLAINS,
GULF COASTAL PLAINS
 INTERIOR PLAINS – FLAT, GRASSY DRY AREAS
FOUND IN MIDDLE OF OUR COUNTRY BETWEEN
THE ROCKY MTS., APPALACHIAN MTS., AND GULF
COASTAL PLAINS; ALSO CALLED GREAT PLAINS
PLATEAUS
 LARGE, RAISED FLAT AREAS; EDGES RISE STEEPLY;
CUT THROUGH BY RIVER VALLEYS AND CANYONS
o EXAMPLES – COLORADO PLATEAU FORMED
THE GRAND CANYON
MOUNTAINS
 TOWER HIGH ABOVE SURROUNDING LAND
 FOUR TYPES
FOLDED MTS. – ROCK LAYERS ARE FOLDED LIKE A
RUG THAT HAS BEEN PUSHED UP AGAINST A
WALL. FORCES SQUEEZE HORIZONTAL ROCK
LAYERS TOGETHER, CAUSING THEM TO FOLD
 EXAMPLE – APPALACHIAN MTS.
UPWARPED MTS. – HAVE HIGH PEAKS AND SHARP
RIDGES. FORM WHEN BLOCKS OF EARTH’S CRUST
ARE PUSHED UP BY FORCES INSIDE EARTH.
 EXAMPLES – ADIRONDACK MTS., ROCKY MTS.
BLACK HILLS
FAULT-BLOCK MTS. – HUGE TILTED BLOCKS OF
ROCK SEPARATED FROM SURROUNDING LAND
BY FAULTS. ONE BLOCK IS PUSHED UP WHILE
THE BLOCK NEXT TO IT DROPS DOWN.
 EXAMPLES – GRAND TETONS, SIERRA
NEVADAS
VOLCANIC MTS. – FORMED FROM MAGMA
REACHING THE SURFACE, AND PILES UP LAVA
LAYER UPON LAYER FORMING A CONE SHAPED
STRUCTURE.
 EXAMPLES – MOUNT SAINT HELENS, MOUNT
SHASTA, MAUNA LOA