Marine Science Geography

3. The name of the supercontinent that used to exist, an idea proposed by Alfred Wegener.
4. ___ boundaries move horizontally past one another.
6. The time it takes for half of a sample to decay.
7. ___ dating is a scientific method of determining the age of rocks, fossils, and other materials.
12. The process of unstable atoms spontaneously transforming into stable isotopes.
13. The stable isotope that forms after radioactive decay takes place.
14. ___ boundaries move away from one another and creates new crust.
16. ___ boundaries move towards one another and either form mountains or subduct.
17. The science of measuring elevation of land.
21. The ___ zone is also known as the sunlight zone.
22. One evidence for Pangea is the fit of ___ along continents.
23. Which type of Earth's crust is oldest?
24. The ___ zone is also known as the abyssal zone.

1. The science of measuring the depth of water.
2. Continental drift is the idea that continents ___ apart over many millions of years and are still moving.
5. The ___ zone includes trenches.
8. The ___ zone is also known as the twilight zone.
9. When a more dense oceanic plate meets a continental plate and one moves beneath the other
10. The ___ zone is also known as the midnight zone.
11. Old methods of mapping the seafloor involved measuring depth with a weighted ___.
15. ___ currents cause the crust to shift and move, which shapes the oceanic and continental crusts.
18. The unstable radioactive isotope that undergoes decay over time.
19. ___ allows us to measure the seafloor more efficiently.
20. ___ from the core causes convection currents in the mantle to churn.