Plate Tectonics (Solliday - Phys. Geo.)
Across
- 1. the movement of heat by flowing substances.
- 2. the large super-continent made of all the continents when they were joined together in the past.
- 4. core the liquid layer within the core made of iron and nickel.
- 6. the solid layer within the core made of iron and nickel.
- 7. the action or process in plate tectonics of the edge of one crustal plate descending below the edge of another
- 8. the older, thick, felsic, low density crust that the continents rest upon.
- 9. A change in the polarity of Earth's magnetic field in which the north magnetic pole becomes the south magnetic pole and vice versa.
- 14. any episode of mountain building in Earth’s past.
- 16. the younger, thin, mafic, high density crust that lies at the bottom of the oceans.
- 17. the layer below the lithosphere that allows the lithospheric plates to move around due to convection currents within it.
Down
- 1. a boundary between two plates that are coming together.
- 3. the theory that the continents drifted about freely on Earth’s surface.
- 5. a theory in geology that the lithosphere of the earth is divided into a small number of plates which float on and travel independently over the asthenosphere and much of the earth's seismic activity and volcanism occurs at the boundaries of these plates.
- 10. when the edges of two crustal plates move past each other in opposite directions perpendicular to each other.
- 11. the divergence at mid-ocean ridges of the tectonic plates underlying the oceans that is due to upwelling from the earth's interior of magma which solidifies and adds to the spreading plates.
- 12. the solid surface of Earth made of the upper mantle and all of the crust.
- 13. a boundary between two plates that are moving apart.
- 15. the thickest layer within Earth’s interior between the crust and core.