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practice Questions: Igneous Rocks1. What is the shade and kind of absent that creates oceaniccrust in ~ mid-ocean ridges?A)B)C)D)light colored and igneouslight colored and also sedimentarydark colored and igneousdark colored and sedimentary4. I beg your pardon graph ideal represents the relative densities ofthree different types of igneous rock?A)2. Obsidian"s glassy texture indicates that that formedA)B)C)D)slowly, deep below Earth"s surfaceslowly, on Earth"s surfacequickly, deep listed below Earth"s surfacequickly, top top Earth"s surfaceB)3. The flowchart listed below illustrates the readjust from meltedrock come basalt.C)The solidification of the melted absent occurredA)B)C)D)slowly, causing fine-grained mineralsslowly, leading to coarse-grained mineralsrapidly, causing coarse-grained mineralsrapidly, leading to fine-grained mineralsD)5. Which igneous absent is dark colored, cooled promptly onEarth"s surface, and is composed mainly of plagioclasefeldspar, olivine, and also pyroxene?A) obsidianC) gabbroB) rhyoliteD) scoria6. Base your answer to the complying with question top top Thephotograph listed below shows an igneous rock.What is the origin and rate of development of this rock?A)B)C)D)plutonic with sluggish coolingplutonic with fast coolingvolcanic with sluggish coolingvolcanic with rapid cooling7. What is the origin of fine-grained igneous rock?A)B)C)D)lava the cooled slowly on earth’s surfacelava that cooled conveniently on earth surfacesilt that resolved slowly in s watersilt that settled quickly in ocean water8. As soon as granite melts and then solidifies, the becomesA) a sedimentary rock B) one igneous rockC) a metamorphic rock D) sediments9. Which rock most more than likely formed straight from lavacooling quickly at earth surface?A)B)C)D)10. The diagrams listed below show the crystals the four different rocks regarded through the same hand lens. Whichcrystals many likely created from molten material that cooled and also solidified most rapidly?A)B)C)11. An extrusive igneous rock v a mineral compositionof 35% quartz, 35% potassium feldspar, 15%plagioclase feldspar, 10% biotite, and 5% amphibole iscalledA) rhyoliteC) gabbroB) graniteD) basaltic glass12. Which procedure is vital for the formation of igneousrocks?A) erosionC) solidificationB) depositionD) metamorphism13. Which characteristic offers the ideal evidence thatobsidian rock created in one extrusive environment?A)B)C)D)layers the rounded fragmentsdistorted bands of big mineral crystalsnoncrystalline glassy texturemineral cement between grains14. Which 2 igneous rocks might have the very same mineralcomposition?A)B)C)D)rhyolite and also dioritepumice and also scoriaperidotite and andesitegabbro and also basalt15. Which loved one concentrations of aspects are found ina felsic rock?A) a high concentration that aluminum and also a lowconcentration of ironB) a high concentration the iron and also a lowconcentration of aluminumC) a high concentration of magnesium and a lowconcentration that ironD) a high concentration of magnesium and also a lowconcentration that aluminumD)Answer KeyRegents Preparation-Igneous Rocks1.C2.D3.D4.D5.D6.D7.B8.B9.B10.D11.A12.C13.C14.D15.A