Across
- 4. an undersea mountain chain where new ocean floor is produced at a divergent plate boundary, also includes underwater volcanoes.
- 5. the theory that the Earth’s surface is made up of giant, moving slabs of lithosphere, made of both oceanic and continental slabs.
- 9. deep underwater depressions created by one plate subducting under another plate at a convergent plate boundary.
- 11. a plate boundary in which plates move towards one another.
- 12. the study of changes in Earth's magnetic field, as shown by patterns of magnetism in rocks that have formed over time
- 13. the process by which new oceanic crust forms as magma rises towards the surface and solidifies, occur at mid-ocean ridges.
Down
- 1. a valley created at a divergent boundary where plates are spreading apart.
- 2. a single land mass, or supercontinent, that existed from about 350 to 200 million years ago.
- 3. a plate boundary in which plates move past one another in opposite directions.
- 6. the idea that continents were once joined in a single landmass that eventually broke apart into pieces that slowly moved away from each other
- 7. a plate boundary in which plates move away from one another.
- 8. when a plate slides under another plate as it more dense than the plate above, occurs at convergent boundaries.
- 10. an area far from a plate boundary in which magma rises from deep within Earth through the lithosphere to reach the ocean floor.