20. This layer is \"structurar (not compositional) and is also known as \"the lo
ID: 288809 • Letter: 2
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20. This layer is "structurar (not compositional) and is also known as "the low velocity zone This strutural layer includes all of the earth's crust and the uppermost mantle. Builiding blocks and rocks; 23. "A naturally occurring crystalline solid with an orderly atomic arangement and a specifie chemical ratio is a A B.mineral C.elemental group D.isotopeE.aggregate r 24. "An aggregate of minerals is a--(choose from # 23 above). For questions # 25-32 use the following A.Muscovite B.Biotite C.K-spar D plagioclase E Quartz .Olivine G. Pyroxene H. Amphibole 25. "Fractional crystallization" of a molten magma results in which mineral being precipitated first as the temperature falls? of fractional crystallization busalt and gabbro. both felsic and mafic rocks This mineral is found in granite and rhyolite and precipitates out toward the end 27. This mineral is the primary iron-rich (discontinuous series) constituent in 28. This mineral is a solid solution between calcium and sodium and is found in 29·Hornblende is an example ofthis group. 30. This mineral is a light or translucent flexible sheet silicate mineral. 1. This mineral is found in small amounts as a flaky dark constituent of granite. 32. This mineral crystallizes out in third order in Bowens Reaction Series. a member of this group is hornb lende. 3. Explosive volanic eruptions are caused chiefly by A accumulation of hot gases B. weight of accumulating pumice C. extrusion of lava from fissures (oozing out) D. occurrence of earthquakes A. felsic B.mafic C. ultramafic D.viscous 34. Most lava flows areExplanation / Answer
20. Asthenosphere. The top of the asthenosphere is called the Low Velocity Zone (LVZ) because the velocities of both P- and S-waves are lower than the in the lithosphere above.
22. Lithosphere. the lithosphere is comprised of both crust and part of the upper mantle.
23. mineral. Mineral is a naturally occurring solid with a crystalline structure.
24. rock. It can be simply defined as the aggregate of minerals.
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