Show:
Continental Drift
Plates
Alfred Wegener
Plates
Randomness
100
the continents moved apart over time
What is the theory of continental drift?
100
8 large plates
How many large plates are there?
100
Continent movement from one spot
What did Alfred theorize?
100
transform, divergent, convergent
What are the 3 types of plate boundaries?
100
broken pieces of Earth's cooled and hardened crust that moves
What are plates?
200
deep sea-floor mapping
What is Bathymetry?
200
9 small plates
How many small plates are there?
200
centrifugal force
What reason did he give for the continents moving?
200
earthquakes
What happens at plate boundaries?
200
relating the building or construction
What is Tectonic?
300
continental drift
What is caused by sea floor spreading?
300
Divide and move away
What does the Divergent Boundary do?
300
1912
What year did he theorize Continental Drift
300
Trenches
What does ocean to ocean convergent boundaries create?
300
formation, movements and interactions of plates
What do plate tectonics explain?
400
where the sea floor spreads and moves
What is the mid-Atlantic Ridge?
400
colliding plates, move toward eachother
What are Convergent Boundaries?
400
Because they believed strongly in land bridges
Why did scientist deny his reasoning?
400
continent to continent
What convergent boundaries creates mountains?
400
heat from cores transfer to the mantle to create currents
What is the Convection Cycle?
500
rocks, fossils, geologic structures (glacier marks), puzzle pieces.
What similarities could continents have the same?
500
slip and slide
What are Transform Boundaries?
500
they fit together like a puzzle.
What is one way he told scientists how he knew they were together at some point?
500
ocean to ocean
What boundaries caused the Mariana's Trench?