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Transcript
INTERNAL FORCES OF THE EARTH
4 layers of earth
 1-crust



Where people live; continents stuck into crust
2-mantle

“hot liquid rock-magma”; like hot caramel
3-outer core
 4-inner core

PLATE TECTONICS

Crust is divided into stiff, moving plates
RING OF FIRE

AREA IN PACIFIC WHERE PLATE IS
THINNER

MORE EARTHQUAKES & VOLCANOES
VOLCANOEHTTP://WWW.VOLCANO.SI.EDU/WORLD/REGION.CFM?RNUM=13S BY REGION
3-MIDDLE OF PLATE
LESS INTERNAL FORCES—HEAT &
PRESSURE
 MORE EXTERNAL FORCES-WIND & WATER

EXAMPLE OF SPREADING--
Plate A
Plate B
Mid
Oceanic
Ridge
“underwate
Volcano”
Sea floor
spreads
PLATE MOVEMENT

FOLDING
PLATES COLLIDING 2

FAULT- PLATE CRACKS & MOVES
TRENCH CREATION—SUBDUCTION
SMALLER PLATE GOES UP/BIG PLATE GOES DOWN
TRANSFORM—PLATES SLIDE PAST
EARTHQUAKE ZONES
PLATES SLIDE PAST EACH OTHER
RESULTS OF INTERNAL FORCES

Types of landforms created


What do they look like?


Mountains, valleys, volcanoes, islands
Higher, jagged, steep slopes
Primary landforms

Created by heat & pressure, plate movement
EXTERNAL FORCES

Rock weathering
Water
 -breaks rock down
 Transports rock

WIND
Transports rocks & minerals
 Breaks down rocks (2 rocks run into each other0
 Creates sand dunes

GLACIERS

Heavy ice
Flattens land
 Picks up sediment
 Leaves some parts behind as it moves


Creates:
Plains
 Fertile land
 Carves out rivers
 Leaves ice that will melt to become lakes

RESULTS OF EXTERNAL FORCES

TYPES OF LANDFORMS


LOOK LIKE?


Plains, plateaus, alluvial fans, deltas,
Lower in elevation, rounded, smaller
SECONDARY

Created by external forces like wind, water, glaciers
CONTINENTAL DRIFT THEORY

PANGAEA
Evidence #1
-Jigsaw
Puzzle
All continents
Seem to fit
together
EVIDENCE

2-fossil remains
EVIDENCE #3-SEA FLOOR SPREADING
HTTP://WWW.TECTONICS.CALTECH.EDU/OUTREA
CH/ANIMATIONS/DRIFT.HTML

Sea floor spreading