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Weathering and Soil Development Lab Report

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Geology
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Lab Report
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Name: Rebeca Rodriguez____________
Revised: December 2018 Page 1 of 8
R
GOL 105: Weathering and Soil Lab
Objective:
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.
Introduction:
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.
Directions:
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)

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Name: Rebeca Rodriguez____________
Revised: December 2018 Page 2 of 8
Figure 1: A Typical Soil Profile
Name of soil horizon
Description
____”O”__ Horizon
First layer that consists of
mainly organic material. Plant
litter and other organic loose or
partly decayed debris.
___”A”____ Horizon
Largely mineral matter mixed
with Humus. O and A together
make up topsoil.
__”E”_____ Horizon
The zone of leaching. Contains
little organic matter. As rain
water percolates down through
soil it leaches out material and
dissolves inorganic
components.
__”B”_____ Horizon
Subsoil
Accumulation of clay that’s
been transported from above.
___”C”____ Horizon
Partially altered parent
material/bedrock
Bedrock
The hard, solid rock that
underlies all of these layers.

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Name: Rebeca Rodriguez____________ R GOL 105: Weathering and Soil Lab Objective: 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. Introduction: 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