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Warm-up for Today Put your Erosion article summary in the Turn-In Bin. Clear your desk. All you need is your agenda and a pen/cil.

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Presentation on theme: "Warm-up for Today Put your Erosion article summary in the Turn-In Bin. Clear your desk. All you need is your agenda and a pen/cil."— Presentation transcript:

1 Warm-up for Today Put your Erosion article summary in the Turn-In Bin. Clear your desk. All you need is your agenda and a pen/cil.

2 Soil Formation and Composition Section 7-2

3 Dirt Excrement Filthy or soiling substance Something worthless Synonyms: filth, dust, grime, muck

4 Soil The loose upper layer of the Earth’s crust in which plants can grow

5 We do NOT say “Dirt”, We say “SOIL” !!!

6 Where does soil come from? Weathered Rock + other stuff Soil

7 Bedrock The solid rock in Earth’s crust When exposed at the surface, it weathers into smaller and smaller pieces to become soil

8 Bedrock weathers to Rock Particles

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10 What is the “other stuff?” 2. Humus 3. Air 4. Water

11 Humus The organic part of soil Formed from decomposed organisms dark-colored Rich in nutrients

12 Loam Loam is the BEST kind of soil. Loam has a good balance of air and water, and holds LOTS of nutrients. Loam contains equal parts of Sand (drainage) Silt Clay (holds water)

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16 Soil Horizons O = litter A = topsoil B = subsoil C = parent material bedrock

17 Life Science RE:visited The Weatherers The Defecators The Decomposed The Decomposers The Aerators

18 Let’s Review! 1. What is the relationship between weathering and soil?

19 Let’s Review! 2. What different materials make up soil?

20 Let’s Review! 3. What is the best kind of soil?

21 Let’s Review! 4. How do plants and animals affect soil?

22 Bedrock weathers to Rock Particles

23 ` DEPOSITION

24 depostion Material added to land 1. Sediment stops moving (erosion) 2. Organic stuff deposited

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35 Loess

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