Earth Science Revision

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Across
  1. 2. The point at which the rock breaks releasing the energy in an earthquake.
  2. 5. The layer of the Earth that is 2900 km thick.
  3. 7. A place that experiences no volcanic activity or major earthquakes because it is far from any plate boundaries is referred to as ___________ stable.
  4. 11. A type of boundary where two tectonic plates are moving away from each other.
  5. 12. A type of tectonic plate boundary where two plates are moving adjacent to each other.
  6. 13. The type of wave in an earthquake that caused the most destruction.
  7. 17. What the S stands for in S-waves.
  8. 19. The point on Earth's surface at the centre of the earthquake.
  9. 20. Another name for boundaries where subduction occurs.
Down
  1. 1. Boundaries in which two tectonic plates move towards each other.
  2. 3. Molten rock beneath the surface of the earth.
  3. 4. The outer part of the mantle in which rock is malleable.
  4. 6. The fastest type of seismic wave.
  5. 8. The crust with the highest density.
  6. 9. The layer of the Earth that is made of solid rock and forms the crust.
  7. 10. A process in which an oceanic plate is pulled under another tectonic plate into the mantle.
  8. 14. When two continental plates converge this type of mountain is formed.
  9. 15. Molten rock that has reached the earth surface.
  10. 16. A scale that measures the amplitude of seismic waves.
  11. 18. During magnetic _________ a compass needle changes from 'magnetic north' to 'magnetic south'.