Tectonic Plates

4. zone the area where subduction occurs
5. ridge a long chain of mountains extending throughout all the oceans
8. outer part of the earth's crust and the mantle
9. core inner most layer of the earth
10. boundary where plates move together; plate collide and interact producing features including trenches, volcanoes and mountains, destructive plate boundaries as they destroy lithospheric crust
12. boundary where plates move apart, most are spreading centers located along the crests of mid-ocean ridges, some spreading centers occur on continents, they are constructive boundaries making new crust

1. crust crust found under the oceans
2. core the liquid layer of the earth
3. crust crust found on land
4. spreading the process when new ocean floor forms along Earth’s mid-ocean ridges and slowly moves outward across ocean basins; new oceanic lithosphere is formed and the floor becomes wider
6. trench long, steep valleys found at the deepest part of the Earth’s oceans
7. tectonics theory Earth’s lithospheric plates move slowly relative to each other, driven by convection currents in the mantle
11. valley deep central valley running down the center of a ridge