Soil Worksheet.docx

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Chaffey College *

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95498

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Geology

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Oct 30, 2023

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pdf

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Name :___________________________ College:______________ THE SOIL TEXTURAL TRIANGLE PRACTICE NOTES 1. How to read a Soil Triangle: https://www.youtube.com/watch?v=cNx4czkFLbA 2. Now it is your turn to use the Soil Texture Triangle. Soil Textural Triangle Practice Exercises % Sand % Silt % Clay Texture Name a) 75 10 15 sandy loam b) 10 83 7 Silt c) 20 20 70 Clay

Soil Texture Worksheet Directions: Using your soil texture chart and example, determine the following soil textures using the percentages given. % sand % silt % clay Soil Texture example 75 10 15 sandy loam a) 42 21 37 Clay loam b) 27 52 21 Silt loam c) 15 35 50 Silty Clay d) 64 30 6 Sandy loam e) 50 10 40 Clay loam Now for a challenge!: f) 36 28 36 Clay Loam g) 20 58 42 Silty Clay h) 75 10 15 Loamy sand i) 25 60 15 silt loam Make your own!! _40___ __10___ _50____ __Loamy clay_____ __45__ _20____ __2____ ____sandy clay_______

WHAT IS THE DIFFERENCE BETWEEN SAND, SILT AND CLAY Sand is a naturally occurring granular material composed of finely divided rock and mineral particles. The composition of sand is highly variable, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide, or SiO 2 ), usually in the form of quartz. The second most common type of sand is calcium carbonate, for example aragonite, which has mostly been created, over the past half billion years, by various forms of life, like coral and shellfish. It is, for example, the primary form of sand apparent in areas where reefs have dominated the ecosystem for millions of years like the Caribbean. Silt is granular material of a size somewhere between sand and clay whose mineral origin is quartz and feldspar. Silt may occur as a soil or as suspended sediment (also known as suspended load) in a surface water body. It may also exist as soil deposited at the bottom of a water body. Silt has a moderate specific area with a typically non-sticky, plastic feel. Silt usually has a floury feel when dry, and a slippery feel when wet. Silt can be visually observed with a hand lens. Clay minerals are typically formed over long periods of time by the gradual chemical weathering of rocks, usually silicate-bearing, by low concentrations of carbonic acid and other diluted solvents. These solvents, usually acidic, migrate through the weathering rock after leaching through upper weathered layers. In addition to the weathering process, some clay minerals are formed by hydrothermal activity. Clay deposits may be formed in place as residual deposits in soil, but thick deposits usually are formed as the result of a secondary sedimentary deposition process after they have been eroded and transported from their original location of formation. Clay deposits are typically associated with very low energy depositional environments such as large lakes and marine basins. The distinction between silt and clay varies by discipline. Geologists and soil scientists usually consider the separation to occur at a particle size of 2 µm (clays being finer than silts), sedimentologists often use 4-5 μm, and colloid chemists use 1 μm. Primary clays, also known as kaolins, are located at the site of formation. Secondary clay deposits have been moved by erosion and water from their primary location Sources: Wikipedia

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