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Soils
1.
Soils: One of Our Natural Resources!
2.
Some call it
dirtโฆ..But it is Soil !!! Soil is made of loose, weathered rock and organic material.
3.
The rock material in
soil contains three noticeable parts: sand, clay, and silt.
4.
Soil, on the average, consists
of 45% mineral, 25% water, 25% air and 5% organic matter. This is just an average!
5.
There are thousands of different
soils throughout the world. Five important factors influence the specific soil that develops.
6.
Parent Material This refers
to the minerals and organic materials present during the soilโs formation.
7.
Parent Material Materials from volcanoes, sediment transported
by wind, water, or glaciers are some examples.
8.
Question Break!
9.
Think about the
soils in our area. Where do you think our โparent materialโ came from?
10.
Our parent material
is mainly Marine sediment (ocean in origin), or produced by steam-river action. It may be thousands of feet deep!
11.
Climate The climate of
a particular region can have a major influence on the rate of soil formation.
12.
Climate Weathering processes like the cycles
of freezing and thawing, along with wetting and drying vary with each region.
13.
Living Organisms Both plants
and animals help create soil.
14.
Living Organisms As they
die, organic matter incorporates with weathered parent material and becomes part of the soil.
15.
Question Break!
16.
Can you think
of some organisms that might help mix and enrich the soil?
17.
Living Organisms The actions of moles, earthworms, bacteria,
fungi, and round worms mix and enrich the soil.
18.
Topography The slope or hilliness
of a region can have a major influence on the moisture and erosion of soils.
19.
Topography In many regions, moist,
poorly drained soils are located in low areas.
20.
Topography Drier, well drained soils
are often found in sloping hillsides. Erosion is often a problem here and can lead to lose of topsoil.
21.
Time It takes hundreds of
years to form one inch of soil from parent material.
22.
Time Only the top
few centimeters are productive in the sense of being able to sustain plant growth.
23.
Time This is why
soil conservation is so important!
24.
Soil Profile In a
cross-section of soil, various zones are formed.
25.
O Horizon: Organic
Layer It consists of leaf litter and other organic material lying on the surface of the soil.
26.
A Horizon: Topsoil This
layer is usually loose and crumbly with varying amounts of organic matter.
27.
A Horizon: Topsoil This
is generally the most productive layer of the soil. Conservation efforts are focused here!
28.
B Horizon: Subsoils Subsoils
are usually lighter in color, dense and low in organic matter.
29.
C Horizon: Transition This
layer of transition is almost completely void of organic mater and is made up of partially weathered parent material.
30.
Bedrock Below the C horizon
the unweathered bedrock will be found.
31.
Last Question!
32.
What would happen
to land based life as we know it, if there was no soil layer?
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