Plate tectonics
Across
- 4. Boundary The boundary formed by the collision of two tectonic plates.
- 6. Boundary The boundary between tectonic plates that are sliding past each other horizontally.
- 7. Break in a body of rock when one block moves relative to another
- 8. Ridge Underwater mountain ranges where new seafloor is created at a divergent boundary.
- 11. type of crust in land, made of granite, less dense
- 12. Zone Location where two plates collide and the denser ocean plate descends below the other.
- 16. sudden, violent movements of the tectonic plates along a boundary
- 17. spreading The process by which new oceanic crust forms as magma rises towards the surface and solidifies. The mechanism for Continental Drift.
Down
- 1. type of plate boundary - two plates move slide past each other
- 2. type of crust, ocean floor, made of basalt, more dense
- 3. Name for the super continent which contained all the plates together.
- 5. Openings in Earth's crust from which molten rock, dust, ash, and hot gases flow or erupt
- 9. Boundary The boundary between two tectonic plates that are moving away from each other.
- 10. Drift The idea that the continents once formed a single landmass, broke up, and drifted to their present locations.
- 11. The thin and solid outermost compositional layer of the Earth above the mantle.
- 13. Extremely deep areas in the ocean that are created by a subducting plate.
- 14. Arc Formed by two oceanic plates colliding volcanoes to form new land
- 15. Tectonics The theory that the Earth is broken into plates and are in motion due to convection currents in the asthenosphere (upper mantle).