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Soil and Glacier

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University of Phoenix Material

Soil and Glaciers Worksheet

From Visualizing Earth Science, by Merali, Z., and Skinner, B. J, 2009, Hoboken, NJ: Wiley. Copyright 2009 by Wiley. Adapted with permission.

Part 1

Size grades of soil are named sand, silt, and clay, which includes colloids. Size grades are defined using the metric system. Use Figure 4.8 from the textbook to fill in the following chart. Specify the type and size and description of the particle. In some cases, particle size will be less than some value or greater than another value. For instance, gravel is greater than 2.0 mm.

Name Size Description
Gravel >2.0 mm Rock that is unconsolidated with fragments that have a general particle size range
Sand 0.05 Sand particles are largerly formed by the physical break up of rocks. Sand has small surface areas and have an almost negligible role in the chemical activity of the soil. Sand particles are chemically insert or inactive.
Silt 0.002 Silt is formed by physical weathering. Finer silits, which approach colloidal sizes, may exhibit some of the characteristics properties of clay.
Clay Below 0.002 milimeters The clay fraction differs from the sands and silts in that it is composed predominantly of minerals formed as products of secondary weathering. The rock mineral will go through change before becoming clay minerals.
Colloids 0.0001 – 0.00001 milimeters Like other soil particles, some colloids are minerals, whereas others are organic. Minerals colloids are usually very fine clay particels.

Reference: Part 2

Soils have been classified according to a system developed by soil scientists and the U.S. Soil Conservation Service. Using this classification system of soil orders, pick two locations on Earth, one in your current area and another...

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