Earth's Layers
The outermost solid layer broken into plates
Lithosphere or Crust
Process that causes tectonic plates to move
Convection Currents
Boundary where plates move toward each other
Convergent Boundary
Two pieces of evidence for continental drift
Fossil records, and continents fitting together like a puzzle
The layer beneath the crust where convection currents occur
The mantle
Alfred Wegener’s theory that continents were once joined
Continental Drift
Boundary where plates move apart
Divergent Boundary
Magnetic patterns recorded in rocks showing seafloor spreading
Paleomagnetism
The source of much of Earth's internal heat
The core
The supercontinent that existed before the continents drifted apart
Pangea
Boundary where plates slide past each other
Convection currents in this layer move the plates
The asthenosphere/mantle
Process that creates new oceanic crust at mid-ocean ridges
Sea - floor spreading
Two features formed at divergent boundaries
Mid-ocean ridge and rift valleys
Layer that is solid but floats on the mantle and moves in pieces
The lithosphere
Where old oceanic crust is recycled back into the mantle
Subduction Zone
Three features formed at convergent boundaries
Mountains, volcanoes, subduction zones