Plate Tectonics

2. A deep valley that forms where two plates move apart; forms at a divergent boundary on Earth's surface
4. the name of the single, ancient, large landmass that broke apart 200 million years ago and gave rise to today's continents
9. the process by which one lithospheric plate moves beneath another plate as a result of tectonic forces
11. an area where magma from deep within the mantle melts through the crust above it
12. the boundary between tectonic plates that are colliding
13. a break in the earth's crust; forms at transform boundary
14. an undersea mountain chain where new ocean floor is produced; forms at an underwater divergent plate boundary

1. the boundary between two tectonic plates that are moving away from each other
3. the boundary between tectonic plates that are sliding past each other horizontally
5. the solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantle
6. a narrow, deep trough parallel to the edge of a continent or island arc where subduction is taking place
7. a string of volcanoes that form as the result of subduction of one oceanic plate beneath a second oceanic plate; forms at a convergent with subduction plate boundary
8. a mountain that forms when rock layers are squeezed together and uplifted; forms at a convergent boundary
10. the process by which new oceanic lithosphere (seafloor) forms when magma rises to Earth's surface at mid-ocean ridges and solidifies, as older, existing seafloor moves away from the ridge