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Soil - PowerPoint PPT Presentation


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Soil. What is soil?. Soil is the part of the regolith that supports plant life The regolith is the layer of rock and mineral fragments Is found in all forms and places all over the world It's sand on the ocean floor, mud in swamps, and dirt in forested and rural areas.

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PowerPoint Slideshow about 'Soil' - belle


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Presentation Transcript
what is soil
What is soil?
  • Soil is the part of the regolith that supports plant life
  • The regolith is the layer of rock and mineral fragments
    • Is found in all forms and places all over the world
    • It's sand on the ocean floor, mud in swamps, and dirt in forested and rural areas.
what is in good soil
What is in “good soil”?
  • Good soil is composed of four different materials: mineral matter (45%), water (25 %), air (25 %), and organic matter/humus (5 %)
  • Water and air are found in the pore spaces in the soil
  • Humus (organic matter) comes from dead and decaying plants and animals
  • Soil water provides moisture and nutrients that sustain life
soil formation
Soil Formation
  • There are five main factors that determine a soil’s characteristics: climate, parent material, time, organisms, and slope
    • Parent material is the source of all mineral matter in soils
    • The longer the soil has to form, the thicker the soil will become.
    • Climate has the greatest impact on soil formation because it impacts rates of weathering.
    • The nutrients within the soil come from organisms. Without this the foods would not be able to sustain life.
    • Slope will impact how thick or thin the soil layer is.
what occurs where
What occurs where?
  • Soil is broken up into different layers or horizons due to different composition
    • Horizon A
      • Topsoil, Composed of organic material; Plants and animals can be found here
    • Horizon B
      • Subsoil; Clay is the major component of this layer (hardpan); This is where you will most likely find the water table
    • Horizon C
      • Partially weathered rock; Deepest tree roots can be found here
    • Unweatherered Parent Material (UPM)
      • This layer is also known as the crust; There will be no roots found here
soil texture
Soil Texture
  • Soil texture refers to the proportions of the different particle sizes that are found in soils
  • Categories are based on the percentages of sand, silt, and clay
  • The soil triangle is a diagram that categorizes soil by texture