Across
- 5. plates that rub together to form earthquakes
- 8. when two or more species affect each others evolution
- 10. where Earth's tectonic plates dive back into the mantle
- 11. Piece of debris from space
- 12. the study of magnetic fields
- 13. using oxygen to live
- 15. a non-living part of an ecosystem that shapes its environment
- 16. stable part of the continental lithosphere
- 18. something that exists between two tectonic plates that are moving away from each other
- 19. pieces of Earth's crust and upper mantle
Down
- 1. not having to use oxygen to live
- 2. The study of earthquakes
- 3. the time required for the radioactivity of an isotope to fall to half its original value
- 4. determining the relative order of past events
- 6. a technique which is used to date materials such as rocks or carbon
- 7. a wave of energy that travels through the Earth
- 8. an area on Earth where two or more lithospheric plates collide
- 9. two or more types of atoms
- 14. living organisms in the ecosystem
- 17. motion in a liquid which the warmer portions rise and the lower portions sink