Across
- 2. A Neoproterozoic supercontinent that was assembled 1.3 - 0.9 billion years ago and broke up 750 - 600 million years ago.
- 3. A small area or region with a relatively hot temperature in comparison to its surroundings.
- 7. Tectonics A scientific theory that describes the large-scale motion of Earth's lithosphere.
- 8. Rim The countries and regions bordering the Pacific Ocean, especially the small nations of eastern Asia.
- 9. An actively deforming region where two or more tectonic plates move toward another and collide.
- 12. A mild tremor preceding the violent shaking movement of an earthquake.
- 14. Rifting The belt or zone of the continental lithosphere where the extensional deformation is occurring.
- 16. An extended break in a body of rock, marked by the relative displacement and discontinuity of strata on either side of a particular surface.
- 18. Activity Relating to or occurring within the interior of a tectonic plate.
- 19. Boundaries An area on the margins of tectonic plates where seismic, volcanic, and tectonic activity takes place as a consequence of the relative motion of the plates.
- 20. A supercontinent comprising all the continental crust of the earth, postulated to have existed in late Paleozoic and Mesozoic times before it broke into Gondwana and Laurasia.
- 21. Currents A current in a fluid that results from convection.
Down
- 1. A linear feature that exists between tectonics plates that are moving away from each other.
- 4. The sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
- 5. Upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
- 6. Faults A strike-slip fault occurring at the boundary between two plates of the earth's crust.
- 10. The point on the earth's surface vertically above the focus of an earthquake.
- 11. A very large igneous intrusion extending deep in the earth's crust.
- 13. Rigid outer part of the earth, consisting of the crust and upper mantle.
- 15. The region of the earth's interior between the crust and the core, believed to consist of hot, dense silicate rocks.
- 17. Spreading The formation of new areas of oceanic crust, which occurs through the upwelling of magma at mid ocean ridges and its subsequent outward movement on either side.
- 21. Form into a hard outer layer: