Tectonics

3. "The preserved remains of ancient life.",
4. "The theory that continents move over time.",
5. "The slow movement of Earth's plates over time.",
6. "The scientist who contributed to mantle convection theory."
9. "The thick layer beneath the crust, made of semi-solid rock.",
12. "The massive supercontinent that existed millions of years ago.",
15. "A deep underwater valley formed by subduction.",
16. "The heat-producing process that contributes to Earth's internal energy.",
17. "The scientist who proposed continental drift.",
18. "The upper layer of Earth's mantle that flows slowly.",

1. "A theory explaining Earth's shifting plates.",
2. "A chain of underwater mountains formed by plate movement.",
7. The process where one tectonic plate moves under another.",
8. The driving force behind mantle movement due to heat.",
10. "The process of new oceanic crust forming at ridges.",
11. "Related to Earth's magnetic properties and pole reversals.",
13. "Earth's outermost solid layer.",
14. "The rigid outer layer of Earth, including the crust and upper mantle.",