Across
- 2. the edges where two plates meet.
- 4. - the rigid outer part of the earth, consisting of the crust and upper mantle.
- 7. - A large landmass
- 9. a planar fracture in rock across which there has been displacement as a result of movement.
- 11. the innermost geologic layer of the planet Earth.
- 12. - The cycle of heating, rising, cooling, and sinking
- 14. - When two plates slide past each other
- 15. a seafloor mountain system formed by plate tectonics.
- 19. - 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.
- 20. single supercontinent that once existed?
Down
- 1. - When two plates move together
- 3. - the gradual movement of the continents across the earth's surface through geological time.
- 5. - a region around a magnetic material or a moving electric charge within which the force of magnetism acts.
- 6. - is the outermost solid shell of a rocky planet
- 8. - a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates which move slowly over the underlying mantle.
- 10. a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's
- 13. - the 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.
- 16. - is the outermost solid shell of a rocky planet,
- 17. - When two plates move apart.
- 18. - the region of the earth's interior between the crust and the core, believed to consist of hot, dense silicate rocks