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How Soil Is Formed!
Transcript of How Soil Is Formed!
??? Soil is the weathered, loose material that plants can grow in. Soil composition
!!!!!!!!!!!!!! Soil is made up of pieces of rocks, minerals, decayed organic matter, air and water. The main part of the composition is bedrock. This is the layer of rock that is below soil. Over time, when bedrock is exposed to the surface world, it is weathered into tiny particles that become part of the soil. The pieces of rock in soil are categorized by the size of their grains as gravel, silt, clay, and sand. Another part of soil is humus This is the part of the soil that gives
nutrients to the plants that grow in it. Soil Fertility Fertility is the measure of how well plants can grow in certain types of soil. Soil that has lots of humus will be more fertile than soil that has lots of sand. Texture Different types of soil that contain varied materials will also have varied textures. Soil that has lots of clay
will have a smooth texture. If the soil contains more sand then it will have a coarse texture. pH Did you know that soil can have acid in it???
Soil can be either acidic or basic. If soil is acidic or contains acid,
it can react with certain types of metals and turn a special kind of blue paper that contains litmus, red. F.Y.I ju Litmus is a coloring substance that is extracted from a plant called lichen. Acidic soil Basic soil Soil is basic if it
contains no acid. And Alex! (We can't forget about her.) w3ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo The process of.. SOIL FORMATION!!! As rocks are weathered and eroded away then mixed with other
materials soil forms. The process of soil formation
can take a lifetime. This a chart that helps you find the texture name of the soil you have. Here is how it works. First you find the percentage of sand, silt and clay in the soil sample you have. Then you find its percent on the triangle and trace it to it's type of soil. As the soil forms it makes layers call horizons.
These are named A, B, and C horizons. The very bottom is called bedrock. The A horizon consist of mostly humus along with clay, and other minerals. It is call the topsoil. The B horizon which is called subsoil, usually has a lot of clay and other pieces of rocks. It doesn't have a lot of humus. The C horizon is formed out of pieces of weathered bedrock. How do living
the soil??? By decomposing and burrowing. Dead plants and leaves add to the main part of humus. These things become
humus through the act of decomposition. Decomposition takes place when decomposers break down the remains of dead organisms into small pieces and digest them chemically. Organisms include fungi,
worms, bacteria and others. Mixing the Soil Worms and other burrowing animals mix
humus with air and other things in the soil. As these creatures burrow and dig, they carry humus to the subsoil and the subsoil to the humus. Some creatures break up the soil while mixing it. Soil Formation Video!!!!!!! Now for a
special finale... Bibliography Interactive Science, Pearson www.merriam-webster.com/dictionary/litmus Thanks for Watching!!!!!!