50) Which of the following groups of igneous rocks exhibit fine grained texture?

ID: 119539 • Letter: 5

Question

50) Which of the following groups of igneous rocks exhibit fine grained texture? A) Granite; gabbro B) Andesite; granite C) Andesite; diorite D) None of the above 51) Which of the following statements is not true? A) The only minerals in the lab sets that will react with dilute hydrochloric acid are carbonates such as dolomite and calcite B) Fluorite has three cleavage directions and may be white (clear), yellow, purple, or blue in colar C) Magnetite is magnetic D) Olivine has an olive green streak color and a conchoidal fracture 52) The end of the Permian Period marks a great extinction event. This event occurred about years agO. A) 65 million B) 200 million C) 250 million D) 540 million 53)The_ __ forms the relatively cool, brittle plates of plate tectonics. A) Asthenosphere Astrosphere D) Hydrosphere 54) rocks form by crystallization of magma. A) Sedimentary B) Indigenous C) Primary D) Igneous 55) rocks always originate at the surface of the solid Earth. A) Secondary B) Igneous C) Metamorphic D) Sedimentary is characterized by very coarse mineral grains, typically several centimeters in length? 56) A) Obsidiarn B) Pumice C) Pegmatite D) Granite

Explanation / Answer

50] Option D is correct

Granite is a coarse-grained, light-colored, intrusive igneous rock that contains mainly quartz, feldspar, and mica minerals. The specimen above is about two inches (five centimeters) across.

Gabbro is a coarse-grained, dark-colored, intrusive igneous rock that contains feldspar, pyroxene, and sometimes olivine. The specimen shown above is about two inches (five centimeters) across.

Diorite is a coarse-grained, intrusive igneous rock that contains a mixture of feldspar, pyroxene, hornblende, and sometimes quartz. The specimen shown above is about two inches (five centimeters) across.

Andesite is a fine-grained, extrusive igneous rock composed mainly of plagioclase with other minerals such as hornblende, pyroxene, and biotite. The specimen shown is about two inches (five centimeters) across.

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50) Which of the following groups of igneous rocks exhibit fine grained texture?

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