34 As compared to aphanitic igneous rocks, phaneritic rocks ane b. finer grained
ID: 289370 • Letter: 3
Question
34 As compared to aphanitic igneous rocks, phaneritic rocks ane b. finer grained c. more mafic d. more felsic An igneous rodk with a mied tur (groundmass) is termed a. porphyritic b. phaneritic c. aphanitic d. necrotic of coarse crystals (phenocrysts coarse crysiala Ghanocayin surrounded by fine Grystal 36. Bombs, ash, and cinders are all examplesof a. intrusive igneous rocks b. hot spots c. volatiles d.pyroclastic debris 37. The presence of vesicles in an igneous rock is evidence that the source ment a. had a mafic composition b. contained bubbles c. underwent fractional crystallization 38. At which of the following does a famous example of hot-spot volcanism occur a. the Aleutian Islands of Alaska b. the Andes Mountains c. Hawaii d. Mt. St. Helens, Washington Volcanoes that do NOT occur along either present or emergent plate boundaries are associated with a. continental rifts b. hot spots c. mid-ocean ridges d. subduction zones prior to solidification. This is because the parent lavas a. are completely devoid of volatiles and thus travel slowly b. erupt underwater and thus cool very quickly c. are highly felsic and thus travel slowly d. are ultramafic and thus freeze at exceptionally high temperatures Pillow basalts attain their distinctive blob-like shapes because their parent lavas do not travel far 40.Explanation / Answer
34 ) option A
aphanitic igneous rock are fine grained so that the texture cant be distinguise. while a pheneritic rock has crustal distinguisable to eyes . so coarse grained will be the answer.
35) option A
A porpheritic texture is termed as a large crystal surrounded by the fine grained ground mass.
36) option D
bomb ash cinders are the product of volcanic activity in the volcano and the are pyroclastic debries.
37) option B
in an igneous rock if bubbles is present it means during crystallisation from the magma the bubble captured in the crystallise rock and then it is removed to give the vesicles structure.
38) option C
hawaii is famous gor hot spot volcanic activity. in hot spot region only one volcano is active and rest are the volcano which were active in past when hot spot was just below that.
39) option B
in option the rest three are associated with the plate boundries only hot spot is the option which can appen any where it need not to occure along any plate boundry.
40) option B
the pillow basalt is charcteristic feature of the oceanic basalt which errupt from the mid oceanic ridges and the crystallise quickly.
41 boulder greater than 256 mm
42 cobble 16 - 256 mm
43 pebble 2- 16 mm
44 silt 1/16-1/256 mm
45 mud less than 1/256 mm
46 permian 299-251 Ma
47 carboniferus 365-299 Ma
48 devonian 418-265 Ma
49 silurian 443 -418 Ma
50 ordovician 485 -443 Ma
51 cambrian 540- 485 Ma
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