6. The atomic number of an element is a. the sum of protons and electrons. b. th
ID: 295640 • Letter: 6
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6. The atomic number of an element is a. the sum of protons and electrons. b. the sum of protons and neutrons. the number of protons. the number of neutrons. True c 7. The most abundant element in the continental crust are 13. a. nitrogen (N) b oxygen (O). c. silicon (Si). d. aluminum (Al). 8. Olivines have a structure composed of a. isolated tetrahedra. b single chains of tetrahedra. C. double chains of tetrahedra. d. 3-dimensional framework of tetrahedra and feldspars have a structure composed of a. isolated tetrahedra. b. single chains of tetrahedra. c double chains of tetrahedra. d. 3-dimensional framework of tetrahedra answer both questions) 9. Rocks that form when magma solidifies beneath the surface of the land are called a. volcanic b. extrusive c. plutonic and rocks that form when magma solidifies on the surface of the land are called a. intrusive b. volcanic. c. plutonic. (answer both questions) o. Which of the following is responsible for the partial melting of mantle peridotite at a spreading center? a. a decrease in pressure as the mantle peridotite is rising b. an increase in temperature as the mantle peridotite is sinking c. an increase in volatiles from the subducting slab 11. Which of the following materials extruded from a volcano is a lava? a. ash b. pumice c. pahoehoe d. lapilli e. silicic and which of the following materials extruded from a volcano is a pyroclastic material? a. lava b. magma c. aa lava d. lapilli e. silicic (answer both questions) 12. Calderas that form from the collapse of the summit of a large composite volcano following an erup are called a. Crater Lake-type calderas. b. Hawaiian-type calderas. C. Yellowstone-type calderas.Explanation / Answer
9. Intrusive (also known as plutonic) rocks are the rocks which are formed when magma solidifies beneath the surface of the earth hence option "C" is correct.and Extrusive (also known as volcanic) rocks are the rocks which are formed when magma solidifies on the surface of the earth hence option "B" is correct.
10. The decrease in the pressure which is present in the divergent boundaries (spreading centres) are the cause of partial melting of peridotite hence option "A" is correct.
11. Pahoehoe lava refers to the flow of the basaltic lava emitted from the volcanoes during the type of eruption and hence option "C" is correct. Lapilli refers to the small stones emitted by the eruption and hence hence option "D" is correct.
12. Crater lake type calderas are the type of calderas which are formed from collapse of a summit of a large composite volcano and hence option "A" is correct.
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