1. A) how can you tell a rock from a mineral? B) how can you tell a nonfoliated
ID: 286953 • Letter: 1
Question
1. A) how can you tell a rock from a mineral? B) how can you tell a nonfoliated metamorphic rock from a plutonic igneous rock? C) how can you tell a breccia or a conglomerate from a porphyry tic rock? D) how can you tell a biochemical sedimentary rock from a fine grained clastic sedimentary rocks? (Remember not all biochemical sedimentary rocks have visible fossils)1. A) how can you tell a rock from a mineral? B) how can you tell a nonfoliated metamorphic rock from a plutonic igneous rock? C) how can you tell a breccia or a conglomerate from a porphyry tic rock? D) how can you tell a biochemical sedimentary rock from a fine grained clastic sedimentary rocks? (Remember not all biochemical sedimentary rocks have visible fossils)
B) how can you tell a nonfoliated metamorphic rock from a plutonic igneous rock? C) how can you tell a breccia or a conglomerate from a porphyry tic rock? D) how can you tell a biochemical sedimentary rock from a fine grained clastic sedimentary rocks? (Remember not all biochemical sedimentary rocks have visible fossils)
Explanation / Answer
1. A. A rock from mineral described simply as " a more than one mineral". Also not single crystals, no shape, no color, not that much pretty, important one is some rocks have fossils.
B. Around igneous intrusions where the temperatures are high but the pressures are relatively low in that situation nonfoliated metamorphic rocks are formed. These rocks are identified on the basis of their composition. For example Marble is composed of calcite mineral; and it is metamorphosed as Limestone. Another one is Quarzite is composed of same mineral but it is metamorphosed as Sandstone.
C. porphyries are rocks that has a distinct difference in the size of the crystals and one group of crystals are larger than another group. A breccia will be a rock comprised of many angular clasts cemented together the clasts will vary in shape and consistency also a sedmentary breccia will have a cement holding the pieces together, while an igneous one will be cemented by lava rock.
D. Clastic sedimentary rocks form when the sediment made by fragments of rocks, minerals and shells, are cemented together. Clasts means loose grains. Mostly produced by the action of chemical and physical weathering. Bio-chemical rocks are derived from dead remains of animals such shells and corals, and algae. Most common part of their chemical composition is CO32-. It can also be classified as limestones. Limestone is composed mainly of calcite (CaCO3). Ex: Chalk is a very fine-grained biochemical limestone. Dolostone also a biochemical rock. Chemical alternation of Ca with Mg(MgCO3).
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