Across
- 3. the study of earthquakes and seismic waves.
- 7. a fault that occurs at a transform plate boundary.
- 8. the layer of Earth made up of the crust and uppermost mantle and ranging in thickness from 65km to 100km.
- 9. Earth's thickest layer, lying just below the crust and making up 70 percent of Earth's volume.
- 10. the large slabs of rock that form Earth's surface, moving over a layer of partly molten rock.
- 11. a large, cone-shaped volcanic mountain; the cone shape is the result of repeated eruptions of ash and lava.
- 14. vibrations caused by energy released by an earthquake.
- 15. the point on Earth's surface directly above the focus where an earthquake starts.
Down
- 1. the region where two tectonic plates are in contact.
- 2. in geology, the location inside Earth where an earthquake starts(plural: foci).
- 4. tectonic plates that are spreading apart.
- 5. the action of one tectonic plate pushing underneath another.
- 6. Earth's outermost layer formed by lighter materials, such as silicon and oxygen, floating to the top during Earth's early cooling period.
- 12. the layer below Earth's mantle.
- 13. the pulling of a tectonic plate as its edge subducts deep into the mantle.