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Study Hall

Study Hall . Sit in your assigned seats and work on something quietly at your desk…. Grab your notebook and a sharp pencil…. Warm up. Draw the rock cycle then tell me h ow soil forms?. Write in Notebook. How much of Earth's crust contains usable soil?. Follow along ….

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Study Hall

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  1. Study Hall Sit in your assigned seats and work on something quietly at your desk…. Grab your notebook and a sharp pencil….

  2. Warm up • Draw the rock cycle then tell me how soil forms?

  3. Write in Notebook • How much of Earth's crust contains usable soil?

  4. Follow along … • On the next available page, draw a picture of the Earth make it big enough to cover the entire page

  5. Follow along… • As we complete each step, mark off the amount of unusable crust found on the Earth’s surface • Write each statement

  6. The Earth’s Unusable Crust • Step 1: Mark out three-fourths of the Earth (this represents the fact that 75 percent of the Earth is water) • Write: 75% of Earth’s is covered by water

  7. The Earth’s Unusable Crust • Step 2: Of the remaining 25%, half is composed of deserts, mountains, bogs, cities, and other areas that do not have usable soil. • Write: 12.5% of Earth is deserts, mountains, and cities

  8. The Earth’s Unusable Crust • Step 3: Of the small slice you have left, 75 percent has temperatures and weather conditions that prevent it from being used for cultivation. • Write: 9.375% of Earth has temperatures too hot or cold (weather)

  9. The Earth’s Unusable Crust • Add up all unusable amounts…. • 75% + 12.5% + 9.375% = 96.875% • That only leaves 3.125% usable soil on the Earth’s surface!!!!!

  10. So, How much is Usable? • Write: 3.125% of the Earth’s surface contains usable soil!

  11. Mr. Parr Soil Song • http://www.youtube.com/watch?v=gx2wVHeiTKE

  12. Soil Diagram • Find the next available page… • Make a circle in the middle of your paper • Write in center: SOILS • Now draw lines out from the circle as shown in the example

  13. Write in Upper Left • Soil ingredients are different: • 1. Parent rock (original rock from which soil was formed) • 2. Climate (temperatures, rainfall) • 3. Organisms found (worms, insects, rodents) • 4. Bacteria and fungi (decomposers)

  14. Write in Upper Right • Soils have different: • 1. Textures (size & type of particles) • 2. pH’s (acid/base 1-14) • 3. Fertility (minerals/nutrients) • 4. Moisture (water) levels • 5. Erosion rates

  15. Write in Bottom Left • Soil Texture: • Sand (largest particle size, feels gritty) • Silt (medium particle size, feels smooth or floury) • Clay (smallest particle size, feels sticky)

  16. Write in Bottom Right Soil horizons (layers) • A horizon: topsoil (surface layer); high in humus (organics) • B horizon: subsoil, high in minerals and clay, lower in organics • C horizon: larger rock fragments on top of parent rock (bedrock)

  17. Soil Horizons (layers)

  18. Soil Horizons Activity • You will receive a handout • You will color your handout and then tape into your book • Follow along as I show you the example

  19. Soil Stories Video • http://www.nrcs.usda.gov/wps/portal/nrcs/main/national/soils/

  20. Remember, soils are different! • These different properties lead to a variety of soils types: • Some soils can support structures and plant growth while some can not!

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