7.E.6.5

3. This fluid substance is made of melted earth. As it cools, new earth is formed.
9. What formed when the edges of continents crumpled and folded
10. Tropical plants in the arctic formed what type of evidence of continental drift
11. When one tectonic plate moves under another plate
12. These waves helped measure the seafloor depth
14. This scientist was able to prove that continents move by demonstrating that the seafloor spread
15. The very top of the earth’s surface
16. The technical term for a weatherman
18. The number of times the continents have reformed and split up
19. Layers of rock
20. The earth’s crust was moving away from each other along these oceanic ________________

1. The word scientists use to describe the earth when all the land was a single mass
2. These happen when plates are grinding against each other
4. Who rejected Wegner’s ideas about continents in motion
5. These currents are in the mantle and they move the earth’s crust
6. Wegener, along with his brother, set a record for the longest time spent in the air in a ____________
7. Sections of the earth that are continually moving
8. Earth closer to the Mid-Atlantic Ridge was __________________
13. Scientists were surprised when they learned the seafloor was not this
17. This large island is on two plates