Across
- 2. the rigid outer part of the earth, consisting of the crust and upper mantle.
- 5. 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.
- 7. hot fluid or semifluid material below or within the earth's crust from which lava and other igneous rock is formed by cooling.
- 8. a slowly moving mass or river of ice formed by the accumulation and compaction of snow on mountains or near the poles.
- 9. tectonics a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates that move slowly over the underlying mantle.
- 10. rock is formed through the cooling and solidification of magma or lava.
- 12. decay is the process by which a nucleus of an unstable atom loses energy by emitting ionizing radiation.
- 14. boundary is a linear feature that exists between two tectonic plates that are moving away from each other
- 15. matter that settles to the bottom of a liquid; dregs.
- 16. quake a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
Down
- 1. rock types of rock that are formed by the deposition of material at the Earth's surface and within bodies of water.
- 3. rock type of rock which has been changed by extreme heat and pressed.
- 4. wear away or change the appearance or texture of (something) by long exposure to the air.
- 6. cycle an idealized cycle of processes undergone by rocks in the earth's crust, involving igneous intrusion, uplift, erosion, transportation, deposition as sedimentary rock, metamorphism, remelting, and further igneous intrusion.
- 11. the process of eroding or being eroded by wind, water, or other natural agents.
- 13. boundary is an actively deforming region where two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide.