Across
- 2. Imaginary vertical line that cuts through the center of Earth
- 3. Earth's yearlong elliptical orbit around the sun
- 8. When one plates slides under another
- 11. The boundary in which two plates are sliding past one another
- 12. Can form as a result of compression
- 15. Plastic-like layer of Earth on which the lithosphere plates float and move around
- 16. When two plates collide
- 17. Rhythmic rise and fall in sea level created by the gravitational attraction of earth
- 18. Occurs when the Moon passes directly between the Sun and Earth
- 20. Hess's therapy that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge
Down
- 1. A large section of Earth's oceanic or continental crust.
- 4. Cone-shaped hill or mountain formed when hot magma erupts onto Earth's surface through a vent
- 5. A measure of the energy released by an earthquake
- 6. When two plates separate from one another
- 7. Wegener's hypothesis that all continents were once connected in a large landmass
- 9. Layer of Earth's atmosphere that is closest to the ground
- 10. Occurs when Earth's shadow falls on the moon
- 13. Made of the crust and a part of the upper mantle
- 14. Remains of prehistoric organisms
- 19. Spinning of Earth on it's imaginary axis