ctivity 6.2 Sediment from Source to Sink me: Course/Section: Date: lok at Fig n
ID: 154119 • Letter: C
Question
ctivity 6.2 Sediment from Source to Sink me: Course/Section: Date: lok at Fig n 5 2.1 Arselfall from one of the steep granitic walls of Yinemie Valley caused boulders as large as 2etosh down into the forested slope below (B). Eventually, these sediments might end up in the steep channeofa 10) on their way to the Merced River (D), which flous through the main part of Yosemite Valley -20 m 200m -9 km Figure A6.2.1 I. Rockfall deposit close to the source area (Photo B) refer to Fig.6.2). The largest sediment grain in B is approximately 2 meters long, Use the grain-size class names listed in Fig. 6.15. (a) List all of the grain sines that you sce or that are likely to be present in the rockfall deposit shown in photo B (also 170Explanation / Answer
1 a-The grains that can be seen are Boulder >256mm Cobble 256-64 mm Pebble 64-4 mm granule 4-2 mm very coarse sand 2-1 mm , Coarse sand 1-0.5 mm, medium sand 0.5-0.25 mm ,fine sand 0.25-0.125 mm very fine sand 0.125-0.0625 mm , silt 0.0625-0.033mm and clay < 0.033mm. The largest grain in figure B is a granule according to udeen Wentworth grain size scale.
B- Sorting is the arrangement of grains according to there size . In a rock fall deposit the grains are usually sorted as finer grains at the bottom and finner at the bottom
C - Shape of the grains can be seen from rounded-sub rounded to angular-sub angular and oval.
D - If the sediments we're lifted as they are , they would form clastic sedimentary rock.
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