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Geology 111 quiz # 3
Geology 111
| Question | Answer |
|---|---|
| which is true? A. rapid decompression melting most commonly occurs at subduction zones? B. most geotherms are at temperatures that are above the dry solidus for most rock types C. a partial melt exist at pressures and temperatures between the solid D. | a partial melt exist at pressures and temperatures between the solid |
| Melting at subduction zones: A. results from an excess of heat in the region B. is very rare C. is enhanced/caused by the presence of water D. none of the above | is enhanced/caused by the presence of water |
| Water: A. raises the melting temperature of most rocks B. is a poor conductor of electricity C. is a polarized molecule, with (+) and (-) sides D. none of the above | is a polarized molecule, with (+) and (-) sides |
| which following magma compositions has the lowest silica (SiO2) content? A.ultramafic B.intermediate C.mafic D.felsic | ultramafic |
| which of theses adds heat to the earth, and serves as the furnace that keep the earth a tectonically active planet? A.heat that results from tidal forces generated by the earths moon B.heat that results from the decay of unstable elements within earth | heat that results from the decay of unstable elements within earth |
| which of the following does not typically result in significant 'heat transfer' A. friction B. radioactive decay C. magma D. all of the above contribute equally to heat transfer | friction |
| partial melts are essentially always more ____ than their source rock A. ultramafic B. intermediate C. mafic D. felsic | Felsic |
Created by:
r2hudson
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