Part 3. True/False. 2 points each. LTFCrystals that grow next to one but do not

Question

Part 3. True/False. 2 points each. LTFCrystals that grow next to one but do not share atoms are not considered to be twins. 2. T F The continuous side of Bowen's reaction series starts with potassium feldspar and ends with Na-rich plagioclase and has solid solution. 3. TFThe depth of formation of an intrusive rock has little effect on textures seen in 4. T FMetamorphism includes changes that occur to rocks under surface or near- 5. T F In Dunham's classification, a limestone that is grain-supported and has mud the rock. surface conditions. matrix is called a packstone. 6. TFGranites found at the surface formed from volcanic eruptions. 7. TFBecause of the temperature at formation, sedimentary rock are more likely to metamorphose than igneous rocks.

Explanation / Answer

False. Twin crystals share same lattice points at the boundary. Lattice points are points where atoms can be placed. In that sense, atoms are shared and has to be considered as twin crytals. False. Continuous Bowen reaction series starts with olivine and ends with Potash feldspar. False. Plutons form deep into the earth surface and depending on the depth they start solidify which decides the texture. False. Changes that occur under or near surface are excluded as the metamorphism means that the rock should undergo forces under tremendous temperature and pressure. True. Packstone is grain supported, wackestone and mudstone are mud supported. False. Granite forms under the earth's crust and not on the surface, False. Igneous rocks due to hgih temperature of fomraiton are more likely to moetamorphose.

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