Geography crossword puzzle

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Across
  1. 4. ___________ crust makes up the continents.
  2. 5. A _________ boundary is formed when two plates slide past each other.
  3. 7. The inner most layer of the Earth is the ____.
  4. 9. ___________ ______ are formed when two oceanic crusts converge.
  5. 10. When two continental crusts diverge, ____ _______ are formed.
  6. 12. Volcanoes are formed due to __________.
Down
  1. 1. _______ crust makes up the ocean floors of the Earth.
  2. 2. _______ ________ are elongated depressions in the sea floor.
  3. 3. The centre layer of the Earth is the ______.
  4. 6. _________ volcanoes are steep at the summit and gentler near the base.
  5. 8. Plates move apart from each other at _________ boundaries.
  6. 11. ____ volcanoes have steep slopes and are formed by acid lava flowing before solidifying.
  7. 12. Liquid resistance to flow is called _________.
  8. 13. Plates collide into each other at __________ boundaries.
  9. 14. ________ plates are pieces of the Earth's crust that make up the surface of the Earth.