Across
- 1. The Earthquake intensity scale based on observation.
- 5. Pieces of the Earth's Crust that float around on the mantle.
- 9. The idea that the continents were once one but have gradually moved apart.
- 10. The scientist who first proposed the idea of continental drift.
- 11. The type of plate that contains a continent.
- 12. The type of boundary where two plates rub against one another, ofen causing an earthquake.
- 13. The type of heat transfer used in the mantle.
- 14. The zone at a convergent boundary where a plate is being destroyed.
- 15. The part of the mantle where convection currents occur.
- 16. The type of boundary where two plates are moving away from one another.
- 18. The layer of the Earth that contains the Upper Manlte and the Lower crust.
- 19. The outer layer of Earth.
Down
- 2. The type of boundary where two plates are moving towards one another.
- 3. The theory most scientists believe now where the Earth consists of several plates on it's crust that are always moving.
- 4. The material that makes up most of the core.
- 6. The type of plate that contains the planet's oceans.
- 7. The 'super continent' that existed 200 billion years ago.
- 8. The spot at a divergent boundary where hot magma rises from the mantle and cools on the surface.
- 13. The very center of the Earth.
- 17. The Earthquake intensity scale based on the measurement of instruments.