Alfred Wegener
How many types of evidence did Alfred Wegener use
3
What was Alfred Wegener's theory
all the continents seem to fit together like puzzle pieces. Continental drift
Largest layer of the earht?
Mantle
Seafloor spreading happens where?
Along mid-ocean ridges.
Why did people not believe Alfred Wegener's theory.
He could not prove how the continents moved.
Who was Harry Hess and what did he discover?
Captain of a ship and he discovered seafloor spreading.
Plate tectonic movement is cased by _______ ______ in the mantle.
convection currents
Explain what happens in sea floor spreading...
Magma rises cools and solidifies and pushes out to the sides forming new crust.
In the Wegeners puzzle which 2 continnts seemed to fit the best?
South America and Africa
Who came first? Alfred Wegener or Harry Hess?
Alfred Wegener
Continents seem to fit together ( what type of evidence)
Jigsaw or Puzzle pieces
Because of seafloor spreading, where would the oldest oceanic floor be found?
farthest away from the mid-ocean ridge.
What were the 3 pieces of evidence that supported Alfred's Wegener's thory?
Coastlines, fossils and mountain ranges.
Continental drift was proposed by who?
Alfred Wegener
Type of evidence that matched plants and animals to different continents
Fossil evidence
Is there a possibility for another Pangaea to form? Why or why not?
Yes because seafloor spreading continues to push continents apart.
in a subduction zone which plate is the one that goes beneath the other?
the denser plate
What was the name of earths supercontinent?
Pangaea
Seafloor spreading was discovered by who?
Harry Hess
Type of evidence used to show that rock type and age match on multiple continents
mountains matching
How were scientist able to prove the theory of seafloor spreading?
Rock samples farther away from the ridge were older than samples found closer to the ridge.
subduction zone
one plate gets pushed under another