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Surface consisting of a mixture of decomposed matter

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Presentation on theme: "Surface consisting of a mixture of decomposed matter"— Presentation transcript:

1 Surface consisting of a mixture of decomposed matter
What is Soil? The part of the earth's Surface consisting of a mixture of decomposed matter and broken down rock.

2 Let’s take a look at this top layer. We call it top soil!

3 Top Soil The rich organic layer of dirt from which
plants get the nutrients they need.

4 Lets take a look at the 3 main
What is topsoil made of? Lets take a look at the 3 main components. Sand Silt and Clay

5 This type has the biggest particles
It is granular and consists of rock and mineral particles that are small. Notice the color of sand in this picture Sand

6 Silty soil is considered to be one of the most fertile of soils.
Very Small particle size Silt Silt Notice the color of silt in this picture Fine Grained

7 Clay is generally considered to be smaller grained than silt.
Clay is relatively impermeable to water. Particles of clay are dense. Clay Tightly packed together Very Fine Grained

8 Good farming soil is generally a combination of all 3 types of soil.

9 Top soil generally accounts for the top 2 to 3 feet of soil on Earth!
Consider the Following: Top soil generally accounts for the top 2 to 3 feet of soil on Earth! So, what percentage of land do we depend on for the world’s food supply? 75%

10 That means that top soil has a
huge responsibility. We’ve got to make sure we take care of it!

11 The Dirt Song


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