wnich of the folloning igneous rocks would be formed the fastest cooling? by 28.

Question

wnich of the folloning igneous rocks would be formed the fastest cooling? by 28. What mineral is shown in this very coarse granite pegmatite Da) quartz b) coarse granite ) medium-grained granite b) feldspar c) calcite d) hematite e) magnetite d) fine-grained granite e) volcanic glass 25. If the area shown in this figure is 240 kilometers wide, and the oldest crest is 4 million years old, what was the approximate 29. The main layers of the Earth in correet order, from the surface moving down, are: a) upper crust, outer core, inner core rate of seafloor spreading a) 0.24 kilometers per million b) 2.4 kilometers per million c) 60 kilometers per million d) 240 kilometers per million mantle b) outer core, inner core, upper mantle, c) crust, mantle, outer core, inner core d) upper mantle, lower mantle, inner core. years years 30. What arrangement of atoms does this diagram illustrate? a) cubic b) tetrahedron c) d) years 960 kilometers per million ycars e) 26. Mid-ocean ridges are elevated above the seafloor. The elevation of the seafloor: a) decreases away from the mid-ocean ridge because of the 31. Which layer on this figure is the oceanie erust? a) A b) B c) C d) D e) E cooling and contraction of the rocks b) increases away from the mid-occan ridge because of the c) decreases away from the mid-ocean ridge because of the d) expansion of the rocks expansion of the rocks increases away from the mid-ocean ridge because of the cooling and contraction of the rocks 27. Which of the following changes in conditions would cause melting of a solid rock? High 32. What specific type of Low a) from A to B b) from B to C c) from C to D d) from A to D e) from A to C distribution of rock units and geologic features exposed on the surface? a) geologic map b) topographic map c) contour map d) shaded relief map

Explanation / Answer

24) Volcanic glass is the igneous rock formed by the fastest cooling.

volcanic glass, any glassy rock formed from lava or magma that has a chemical composition close to that of granite(quartz plus alkali feldspar). Such molten material may reach very low temperatures without crystallizing, but its viscosity may become very high. Because high viscosity inhibits crystallization, a sudden cooling and loss of volatiles, as when lava extrudes from a volcanic vent, tends to chill the material to a glassrather than to crystallize it.

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.