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Chapter 15: Weathering, Soil, and Unstable Slopes

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Calcite: off white. http://www.pitt.edu. Quartz: white. Organic matter: black ... Fun Fact: It takes 100 to 600 years to form an inch of topsoil. ... – PowerPoint PPT presentation

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Title: Chapter 15: Weathering, Soil, and Unstable Slopes


1
Stop Treating Soil Like Dirt! Exploring the
Amazing Properties of SoilDr. Greg
Pillar Department of Environmental ScienceQueens
University of Charlotte
2
Q Whats the difference between soil and dirt?
A. Location, location, location!
3
Lets Get Dirty!
Er, Soily?
4
What is Soil?
How would you describe soil?
  • Color
  • Texture

5
Why the color?
Hematite red
Goethite yellowish brown
Ferrihydritereddish brown
http//www.pitt.edu
http//www.organicgardeninfo.com
Calcite off white
Quartzwhite
Organic matterblack
6
Soil Color Variation
7
Soil Color by Horizon
Fun Fact It takes 100 to 600 years to form an
inch of topsoil.
A horizon organic coatings
B horizon Iron coatings
C horizon little coating
http//nesoil.com
8
Soil Color Variation by Geography
Red soils Southeast US
9
Soil Color Variation by Geography
Brown/black soils Midwest
10
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11
Soil Color Variation by Geography
White (gypsum) sands New Mexico
http//www.scienceclarified.com
12
Soil Components
Q What did the shy pebble say to the big rock?
A. Do you think Ill ever be alittle boulder?
http//school.discoveryeducation.com
13
Thien, 1979
14
Fine Texture - Clay
https//www.soils.org/lessons
15
Course Texture - Sand
https//www.soils.org/lessons
16
Soil Texture
Fun Fact There are over 20,000 different soil
types of soil recognized in the US alone!!!!
The relative portions of sand, silt, and
clay-sized particles
Sand 2.0 0.05 mm
Silt 0.05 0.002 mm
Clay lt 0.002 mm
17
Sand Silt Clay 100
40 Sand
Texture LOAM
40 Silt
20 Clay
18
What is Soil?
The unconsolidated mineral or organic matter on
thesurface of the earth that has been subjected
to andshows effects of genetic and environmental
factors.
19
Soil Components
Organic Matter (leaves, plant roots, etc) (5)
Air (25)
A layer
Rocks(Minerals) (45)
B layer
Water (25)
C layer
20
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21
Why is Soil Important?
Fun Fact 1 teaspoon of good soil contains more
than 1 million bacteria!
Fun Fact There are more living organisms in a
cubic foot of soil then all of China!
Soil supports life
http//www.Istockphoto.comL. Clarke and Corbis,
2008
22
Soil stores important nutrients
Phosphorus (P) Nitrogen (N) Potassium (K) Calcium
(Ca) Magnesium (Mg)
http//www.lesco.com/
23
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24
Soil Holds Water
25
Soil provides support for buildings
http//www.pbase.com
26
Soil filters, buffers, detoxifies.
Soil
http//extension.missouri.edu
27
Why is Soil Texture Important?
28
Lets Do The Demo!
29
(No Transcript)
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