HOW DO WE KNOW ABOUT EARTH'S INTERIOR

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Across
  1. 5. The central part of the Earth
  2. 6. Type of explosion created by humans to study the crust
  3. 10. Layer of the Earth studied using boreholes
  4. 13. Boundary inside the Earth where seismic wave speed changes
  5. 15. Earth layer beneath the crust that volcanoes give information about
  6. 16. Seismic waves that cannot travel through liquids
  7. 18. Tool used by scientists to locate Earth’s internal layers
  8. 19. Method of studying the Earth that does not involve direct observation
Down
  1. 1. The fastest type of seismic wave
  2. 2. Change in direction of seismic waves as they pass through different materials
  3. 3. Molten rock found beneath the Earth’s surface
  4. 4. Energy waves produced by earthquakes that travel through the Earth
  5. 7. Deep holes drilled into the Earth to study the crust
  6. 8. Natural event that releases large amounts of seismic energy
  7. 9. Material that S waves cannot pass through
  8. 11. Increase in this occurs as depth increases inside the Earth
  9. 12. Area where molten rock reaches the surface
  10. 14. Molten rock that reaches the Earth’s surface
  11. 16. Scientist who studies earthquakes
  12. 17. Instrument used to record earthquake vibrations