Earth Physics

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Across
  1. 4. The substance that a wave passes through.
  2. 6. The innermost part of the Earth.
  3. 7. The outer layer of the Earth.
  4. 8. A reflected sound wave
  5. 9. _______ Waves: Vibration of particles parallel to the direction of transfer of sound energy.
  6. 11. The smallest part of a substance.
  7. 13. Sudden movement in the Earth's crust and upper mantle caused by the release of pressure between two tectonic plates.
  8. 14. The layer between the core and the crust.
  9. 15. Opening in the Earth's surface where lava, ash and gas can come out onto the Earth's surface.
Down
  1. 1. Hot molten material below the Earth's crust.
  2. 2. To hit a surface and bounce back.
  3. 3. The highness or lowness of the tone of a sound.
  4. 5. ________ Plates: Pieces of Earth's crust and upper mantle.
  5. 10. Molten rock coming out onto the Earth's surface.
  6. 12. A measure of how easy a sound is to hear.
  7. 14. Something that has melted.