Across
- 1. Spreading The formation of new areas of oceanic crust at midocean ridges and its movement on either side
- 3. Rock Rock that forms when magma cools on the surface or underground
- 5. Boundary When two plates separate causing sea-floor spreading, creating underwater volcanic chains, and rift valleys
- 7. Rock Rock that forms when existing rocks change due to heat and/or pressure
- 8. Tectonics The process that changes the surface of the Earth through the movement of the lithospheric plates
Down
- 1. Rock Rock that forms when pebbles, sand shells, and other pieces are cemented together over time
- 2. Boundary When two plates move together to form volcanoes, islands, and other landfarms
- 4. When one tectonic plate pushes underneath another in the mantle where it melts
- 6. Boundary When plates scrape past each other causing strong earthquakes