Plate Tectonics
Across
- 3. Scientists who made the theory of seafloor spreading
- 6. Creator to the theory of Pangea
- 7. a current in a fluid that results from convection.
- 10. The theory that Earth's outer shell is divided into several plates that glide over the mantle
- 14. The upper layer of the earth’s mantle
- 17. When all the continents fell apart from each other
- 19. All Land
- 20. An elongated valley formed by the depression of a block of the earth's crust between two faults or groups of faults of approximately parallel orientation.
Down
- 1. The rigid outer part of the earth
- 2. The upper part of the mantle is composed mostly of peridotite
- 4. Theory that seafloor is formed when magma is forced upward
- 5. The middle of the earth
- 8. The boundary where two plates come together
- 9. It is composed mostly of silicate rocks rich in magnesium and iron.
- 11. The boundary between two plates moving apart
- 12. Occur where two plates slide past one another in opposite or same direction
- 13. a large landform that stretches above the surrounding land in a limited area, usually in the form of a peak.
- 15. The area where one plate goes under another
- 16. The two sub-layers of the Earth that move and float and can cause earthquakes
- 18. A mountain that Explodes