Structures of Earth

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Across
  1. 3. The 2 metals that make up Earth's core are nickel and _____
  2. 4. The gases surrounding the Earth
  3. 9. Outer layer of Earth
  4. 11. Hot rock inside Earth melts into this liquid
  5. 12. The 2 main gases in Earth's atmosphere are nitrogen and _____
  6. 13. This layer of Earth is divided into several slow-moving plates of solid rock that hold the continents and oceans
  7. 14. The only liquid layer of Earth
  8. 15. Thick layer of Earth made up of upper and lower
  9. 16. Deep crack in rocks found near tectonic plates
Down
  1. 1. Lowest layer of Earth's atmosphere
  2. 2. Makes up the dry land on Earth
  3. 5. Hot, solid sphere of iron and nickel at center of Earth
  4. 6. The hot semi-liquid zone in upper mantle
  5. 7. Makes up the ocean floor
  6. 8. The imaginary line around Earth's middle
  7. 10. A vent in the planet's crust which lava, ash, rock, and gases erupt