12.4

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12.4 Third period only

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  • 12.4

    1. 1. Weathering,Soil, and Erosion 12.4 Soil as a resource
    2. 2. Know• soil fertility• soil depletion• salinization
    3. 3. Understand• Soil is an important resource that can be conserved and protected.
    4. 4. Do• Describe ways is which human activity threatens soil fertility.• Summarize soil conservation methods that reduce soil erosion.
    5. 5. 4. Nutrients return to soil3. Plants die and 1. Soil containsdecompose in the ground nutrients 2. Natural vegetation 5. Crops use uses nutrients nutrients 6. Crops are harvested 7. Fertilizers must be added to replace nutrients.
    6. 6. List and briefly describe threemethods of preventing erosion offarmland. • Windbreaks: planting belts of trees along field edges. Contour farming: planting crops in rows parallel to land contours. Constructing terraces: flattening sloping areas by forming terraces. Strip cropping: alternating a crop that leaves bare ground with a crop covers the ground. No-till farming: doing planting, fertilizing, and weed control at the same time.
    7. 7. 12.4 #1. Describe some ways to prevent soil depletion. • #1. Allowing fields to lay fallow, Allowing a crop to decompose on the soil, and changing the kind of crop grown on a field from year to year.
    8. 8. Uruguay Pointe-de-Rivere- du-Loupe, Canada Colorado
    9. 9. #2. How and where does salinization occur? • #2. Salinization occurs in desert areas when irrigation water evaporates rapidly and minerals dissolved in the water are left behind on the soil surface.
    10. 10. Montana CaliforniaSouth Africa
    11. 11. #3. Describe at least three methodsthat can be used to protect a fieldfrom wind or water erosion. • #3. Windbreaks: planting belts of trees along field edges. • Contour farming: planting crops in rows parallel to land contours. • Constructing terraces: flattening sloping areas by forming terraces. • Strip cropping: alternating a crop that leaves bare ground with a crop covers the ground. • No-till farming: doing planting, fertilizing, and weed control at the same time.
    12. 12. New Zealand
    13. 13. Corn Oats & radish
    14. 14. #4. Terrace farming is used to reduce erosion.Explain how terrace farming could also increasethe amount of land available for farming. • #4. Some slopes may be too steep for use in farming. By creating terraces on these slopes, unusable land becomes farmable land.
    15. 15. LaosPeru
    16. 16. #5. One estimate for the rate at which natural processes canreplace topsoil that has been eroded is about 2 millimeters peryear. At this rate, how long would it take to form 10 centimeters ofnew topsoil? Show your work. • 2 mm X 1 cm = 0.2 cm#5. 1 year 10 mm 1 year • 10 cm X 1 year = 50 years 0.2 cm

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