Earth Vocabulary

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