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Soil

Soil. Soil is a material that forms the crust of the earth. It comes from the weathering of rocks and decomposition of organisms. It is formed very slowly. What is soil?. Minerals Organic matter Air and water Living organisms. What’s in soil?. Soil is found in layers called horizons.

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Soil

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  1. Soil

  2. Soil is a material that forms the crust of the earth. It comes from the weathering of rocks and decomposition of organisms. It is formed very slowly. What is soil?

  3. Minerals Organic matter Air and water Living organisms What’s in soil?

  4. Soil is found in layers called horizons

  5. Soil-notice the layers in the soil

  6. O = Organic The top, organic layer made up mostly of leaf litter and humus. Humus is decomposed organic matter. O horizon(green)

  7. A = Topsoil. Dark colored Where seeds germinate and roots grow. This is generally the most productive layer of soil. A horizon(dark brown)

  8. B = Subsoil Lighter colored Contains clay and mineral deposits (iron, aluminum, etc) B horizon(light brown)

  9. C = Parent Material Layer of large unbroken rocks C horizon(tan)

  10. R = Bedrock. The solid rock that is under the soil R horizon(black)

  11. Areas with a lot of humus and topsoil are great for growing plants.

  12. Desert Soil (hot, dry climate) Grassland Soil (semiarid climate) Alkaline, dark, and rich in humus Mosaic of closely packed pebbles and boulders Clay, calcium compounds Weak humus- mineral mixture Dry, brown to reddish-brown, with variable accumulations of clay, calcium carbonate, and soluble salts

  13. Forest litter leaf mold Acid litter and humus Acidic light- colored humus Humus-mineral mixture Light-colored and acidic Light, grayish- brown, silt loam Iron and aluminum compounds mixed with clay Dark brown firm clay Humus and iron and aluminum compounds Tropical Rain Forest Soil (humid, tropical climate) Deciduous Forest Soil (humid, mild climate) Coniferous Forest Soil (humid, cold climate)

  14. Tomorrow you will meet in the computer lab (229) and complete a soil webquest. You will learn how rainfall affects topsoil depth. Soil lab online

  15. Answer the review questions as a group. Use this diagram to label the layers pictured in #4. You will still need to name and describe them (except layer E) Remainder of the period

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