A 56% 1:47 DM 2014 Mumple owie (2 points each 1.3 The most abundant sedimentary

Question

A 56% 1:47 DM 2014 Mumple owie (2 points each 1.3 The most abundant sedimentary rock on the Earth's surface is A J sandstone El conglomerate 2.J Where would you expect to see a stream's competence at its greatest? AJ At base l evel, where it dumps huge amounts of sediment into the sea in the form off deltas 1 In mountainous areas, where the gradient is very high C I in deserts, where the volume of water is low D J in New Jersey 1.) The degree of roundness of quartz is a function of A.j the energy of deposition &J; the time spent in a stream CJ the chemical compouition of the quartz D.J the pM of the water 4.) Sandstones are classified on the basis of what three components? AJ quartz, feldspars, and m 8.) quarts, feldspars, and micas (e g. muscovitel C) quartz, feldspars, and lithic fragments D J feldspars,calcite, and dolomite 5.J Which of the following would indicate an igneous provenance? A) nonundulatory quartz and unzoned plagioclase 8J highly undulatory quartz and unzoned plagioclase. C) non-undulatory quartz and strongly zoned plagioclase DJ highly undulatory quartz and strondy zoned plagioclase 5.J These sedimentary rocks are deposited in low-energy depositional environments: A) sandstone 8.] conglomerate C.) breccia D.) mudstone ) Why are paleocurrent indicators rare in mudstones, whereas they are relatively common in sandstones and co AJ Mudstones are more easily eroded, thus paleocurrent indicators are less likely to be preserved. 8.) Mudstones and their paleocurrent indicators are more susceptible to diagenetic alteration CJ Mudstones are deposited in very slow moving, or even sill, water D.J Paleocurrent indicators are not rare in mudstones; they are microscopic and therefore difficult to ob ow can you tellif the compound grains in a carbonate are intraclasts or extraclasts? Ai) Extraclasts will usually also be associated with detrital quartz and feldspars and other lithoclasts 8J intraclasts will always be granitic (or some other igneous lithology. C) intraclasts will be cemented together with carbonate cement, whereas extraclasts will have silica ce D.J all of the above. andstone that has roughly equal amounts of feldspar and quarta, but no lithlic fragments, is called a: A.) arenite B)) arkose. ) litharenite D.) feldspathic litharenite.

Explanation / Answer

1)(B) limestone

Limestone is the most abundant sedimentary rock present in the earth surface.

2) (B) in mountainous areas, where the gradient is maximum

Stream competency increases with increase in velocity of flow.

3) (B)

Abrasion is the major cause of roundness of quartz, in river or stream beds by current flow, wave impact, wind etc.

4) (C) quartz, feldspar and lithic fragments

Sediment are classified presence of 3 dominant components namely quartz, feldspar and lithic fragments.

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