12. Followings are properties of dark silicate minerals. Choose the answer which
ID: 120605 • Letter: 1
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12. Followings are properties of dark silicate minerals. Choose the answer which is correct for these minerals A. they contain the heavier elements iron and/or magnesium B. they have higher specific gravities C. they have higher melting temperature D. all of the above 13. Which is not a common nonsilicate mineral A. calcite B. dolomite C. gypsum D. sugar 14. Igneous, sedimentary and metamorphic are three major types of rock. Volcanic rock belong to A. Igneous rock B. Sedimentary rock C. Metamorphic rock D. None of the above 15. Which word describes the texture of which the magma cooled rapidly such as under volcanic conditions? A. Aphanitic B. Phaneritic C. Porphyritic D. Glassy 16. How do the holes form in vesicular igneous rocks, such as scoria and pumice? is released A. Entrapped gases came out from the liquid magma when the pressure B. Molten blobs were ejected during a volcanic eruption. C. Viscus rocks were quickly solidified under the water. D. Ice was formed when the molten rocks were solidified. 17. Geothermal gradient shows the variation in temperature with depth under the ground surface. Choose a sentence which describes geothermal gradient correctly A. Temperature decreases as depth increases B. Temperature is approximately constant with depth. C. Temperature increase as depth increases D. There is no scientific trend.Explanation / Answer
12. Dark silicate minerals has iron and magnesium. And they have specific gravity. They have higher melting temperatures.
13. Sugar is not a non silicate mineral. The remaining belongs to non silicate minerals.
14. Volcanic rocks belongs to the Igneous rocks. They are formed on the volcanoes and are the first rocks.
15. Aphanitic texture is the when magma is cooled rapidly.
16. A. Entrapped gases came out from the liquid magma when the pressure is released. This is because of the rapid cooling and rapid depressurization.
17. C. The temperature increases as the depth increases. As we go near to the core the temperature will increase.
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