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Plate Tectonics (Continental Drift # (Fits like a puzzle (Continents fit…
Plate Tectonics
Continental Drift
#
Fits like a puzzle
Continents fit together
Pangaea
Ancient land where all continents where connected
over time they split up and moved apart
Fossils match
Fossils from different continents match each other
Ancient Climate
Climates match each other
Indicates places had to be near of connecting to each other
Found fossils of swamp plants in Antarctica
Climate had to be warm to have a swamp
Geologic Units match
Mountains on different continents match
Rocks do as well
Appalachians and Alps mtns. match
Alfred Wegener
Found all of this evidence about his claim of continental drift
Boundary
Transform
Plates are sliding sideways past each other
Rub and can cause earthquakes
Convergent
Collides
Plates are moving towards each other
One plate dives below the other
Divergent
Divide
Plates moving away from each other
Place where new crust forms
The only place
Plates
Oceanic
More dense
made of metals
Continental
less dense
Made of silica
Plate boundaries cause:
Mountains
Volcanoes
#
Cinder cone
Shield volcano
Composite Cone
Earthquakes
Tsunami
Islands
Oceans
Hot spots
Magma pushes up through the crust
Doesn't have to be near a plate boundary
Don't move
Cause volcanoes
Plates move
Hot spots don't move
Creates new volcanoes
HOW
Many Questioned Alfred Wegener about his theory
Didn't have evidence of how they moved
#
How did they move that far and what force caused it
Evidence
Middle of ocean floor is young (Floor)
Outer parts are old
Sediment Thickness
Thick at the edges and Thin in the middle
Magnetic Reversals
Sea floor has positive and negative stripes
