| A | B |
|---|
| where subduction happens | deep on the ocean floor in trenches |
| when two plates collide | convergent boundary |
| what moves the plates | convection currents in the mantle |
| when two continental plates diverge | a rift valley forms |
| convection currents happen | different temperatures and density in a fluid |
| deep ocean trenches | oceanic crust sinks back into the mantle |
| magnetic stripes | bits of iron that lock in place in molton materials |
| Wegener's 3 pieces of evidence | climate, lanform, fossil |
| Hess's 3 examples of sea floor spreading | magneticmagnetic strips, rock samples, molten materials |
| fault | break in the earth's crust-rocks have slipped past each other |
| solid layers of earth | crust, lithospere, inner core |
| solid but flowing layer of earth | athenospere |
| liquid layer of earth | outer core |
| earth's plates that are less dense | continental crust |
| earth's plates that are more dense | oceanic crust |
