hypothesis stating that the continents once formed a single landmass, broke up, and drifted into their present locations
neither plate is subducted, because they have the same density, so the colliding edges are crumpled and uplifted, producing large mountain ridges including the Himalayas
the theory that all geologic phenomena may be explained as the result of existing forces having operated uniformly from the origin of the earth to the present time
border formed by the collision of two lithospheric plates, creates deep ocean trenches
wegener found identical fossil on both eastern South America and western Africa, and since they couldn't have swam all that way and there weren't any known land bridges, they must have been connected at some point.
caused by sea floor spreading, magma emerges from rift to create new rocks
system of undersea mountain ridges that wind around the earth
Evidence of plate movement
boundary formed by two lithospheric plates that are moving apart
Transform or Strike-Slipe or Lateral Fault
boundary formed where 2 lithospheric plates slide past each other (San Andreas)
a collision where the less dense oceanic crust is subducted under the denser continental crust
Oceans crust is rich with what rock?
Continental crust composed of what rock type?
Gaps in the rock record
zone where younger plates are recycles, go under the firmer, denser older plate because the younger is more malleable
- the volcanowill be on the overriding plate, younger plate causes partial melting and
pushes magma up
polarization recorded in rocks show that polarity has reversed multiple times