Earth Structure Crossword

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Across
  1. 2. The solid, outer layer of the Earth that makes up the plates
  2. 4. The layer of Earth between the liquid outer core and the asthenosphere
  3. 7. A place on the surface of the Earth where two plates move toward each other, and the oceanic plate plunges beneath the other tectonic plate
  4. 8. The layer of the Earth between the crust and the core
  5. 9. The boundary between two tectonic plates that are sliding past each other
  6. 10. The transfer of thermal energy by the movement of a hot liquid or gas
  7. 13. A long, undersea mountain range along the floor of oceans where two plates are spreading apart
  8. 15. The process by which new oceanic lithosphere forms at a mid-ocean ridge as magma rises to fill the crack left by diverging plates
  9. 16. The name for the single landmass composed of all of the present day continents that existed about 250 million years ago
  10. 17. The boundary between two tectonic plates that are moving away from each other
Down
  1. 1. The central part of the Earth below the mantle, composed mostly of iron
  2. 3. The modern theory that explains that the surface of the Earth is made up of lithospheric plates that move and change shape
  3. 5. The thin and outermost layer of the Earth above the mantle
  4. 6. The layer of Earth between the mesosphere and the lithosphere
  5. 11. The boundary between two tectonic plates that are colliding with each other
  6. 12. The separating of the Earth into layers
  7. 14. The catastrophe in Earth history about 4 billion years ago when most of this element melted and sank