Boundaries
The edges of the plates at this boundary are creating mid-ocean ridges
Divergent Boundary
He made the hypothesis of continental drift
Alfred Wegener
what is the movement of molten rock in the mantle called
Convection Currents
subduction only occurs at this kind of boundary
Convergent boundary
What are the Earth's tectonic plates made of
The lithosphere
When two plates move past each other in opposite directions, it's this kind of boundary
Transform Boundary
What did Wegener notice about South America and Africa?
They appeared to fit together like puzzle pieces
What layer of the earth causes the lithospheric plates to move?
the asthenosphere
These can formed at the edge of a plate boundary where the oceanic plate subducts under another plate
ocean trenches
If a beach has cliffs and geological activity it is near what type of continental margin?
An Active continental margin
When two plates collide,it is this kind of boundary
Convergent boundary
One critical piece of evidence wegener observed to support his idea of continent drift
Fossil evidence -- the same fossils were found on different continents. (other possible answers are climate, rocks/mtns, etc)
What is magnetic polarity
Iron particles in rocks line up with earth's magnetic field.
These are formed directly above the area under the lithosphere that the subduction plate starts melting back into the asthenosphere
volcanoes
Tectonic plates are either all continental crust or all oceanic crust? T or F? Explain.
F. Most are one or the other, but some can have a combination of both types of crust
When an oceanic crustal plate collides with any other kind of plate, it will always do this
Be destroyed, Subduction
What did Wegener notice about the Appalachian mountains that supported his continental drift idea?
That they matched up with mountain ranges across the ocean and must have formed as a single range.
What is seafloor magnetism
It shows seafloor spreading by matching magnetic stripes on either side of mid-ocean ridges.
When two oceanic crustal plates collide, the one that subducts is
The older, more dense plate
Hawaii and Yellowstone are not created by plate boundaries but by
Hot Spots
when two continental plates collide, they produce this
What evidence did wegener find about glaciers that helped prove his hypothesis about continental drift
Glacial deposits were found in Africa near the equator but that's impossible! The land must have moved from its position.
Why is polarity evidence of plate tectonics
The magnetic particles in rocks stay pointed in the direction of the location of the North pole when the rock formed. The rocks on different continents point in different directions from the original meaning the continent moved.
The subduction zone between an ocean to ocean plate convergent boundary creates
volcanic island arcs
The plates have come together and seperated many times, creating these .... and name an example
supercontinents, Pangea