Jeffrey Aba_Module 06 Part 1 Weathering and Soil Lab

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George Mason University *

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MISC

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Geology

Date

Dec 6, 2023

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pdf

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8

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Name: Jeffrey Aba GOL 105: Weathering and Soil Lab Objec&ve: The objective of this exercise is to help familiarize you with the basic soil profile, the processes responsible for creating each of the horizons within the profile, and the general characteristics of weathering of geologic material . Introduc&on: This exercise will utilize the information contained in Chapter 6 (Weathering and Soil) in your textbook. All work can either be completed directly on this document (save it to your hard drive with a file name that includes your last name, then complete the exercise, save your copy, and then submit it via Blackboard). Another option is to print it, draw/write on the paper, then scan or photograph it to make digital files capable of being submitted via Blackboard. Note that you will have to draw on several photos, either with pen/pencil or digitally. Direc&ons: 1. Read Chapter 6 (Weathering and Soil) in your textbook. 2. Complete Table 1 . Identify the soil horizons in a typical soil profile. Fill in the name of the soil horizons in the left hand column of the figure, and give a brief description of the content and processes in each of the horizons in the left hand column. (10 pts) 3. Complete Table 2 . Identify the five (5) most important factors affecting the development of a soil at any given location. List each factor separately in the left side column of the table, and then briefly discuss a few specifics on how this may affect the development of a soil profile. Which horizons will be most affected by each factor? (10 pts) 4. Complete Figures 3, 4, and 5 . Try your hand at identifying the various soil horizons in each of these two figures. Draw the boundaries on the photo , and clearly label each horizon with the corresponding letter (O, A, E, B, etc .). Labels may be placed in the white space next to the photo for clarity. (10 pts) Revised: December 2018 Page of 1 8
Name: Jeffrey Aba Figure 1: A Typical Soil Profile Name of soil horizon Descrip&on ____O___ Horizon Contains organic materials. Upper por&on is primarily oragnic liJer mainly plant based. Lower por&on contains decomposed organic maJer. Organisms within contribute oxygen, carbon dioxide, and organic acid to boost soil. ____A___ Horizon Mainly mineral maJer. Humus, or decomposed organic maJer, s&ll present. O and A make up the top soil. ___E____ Horizon Light colored and contains liJle organic maJer. Par&cles carried away by water seeping through. “Zone of leaching” ____B___ Horizon “Subsoil.” Material removed from E horizon deposited here. “Zone of accumula&on.” Clay enables horizon to hold water. ____C___ Horizon Unweathered parent materials. Eventually will turn to soil, but hasn’t sperated regolith from soil. Revised: December 2018 Page of 2 8
Name: Jeffrey Aba Bedrock Lowest layer. Hard, solid rock. Source of nitrogen. Name of soil horizon Descrip&on Revised: December 2018 Page of 3 8
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