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Grade 7 Science

Grade 7 Science . Earth and Space Science: Earth’s Crust and resources (EC). Lesson 8 a . What is soil?. Soil is not one thing but rather a blend of many constantly changing components Did you know that three to six different types of soil may be found in your backyard?. Soil.

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Grade 7 Science

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  1. Grade 7 Science Earth and Space Science: Earth’s Crust and resources (EC)

  2. Lesson 8a

  3. What is soil? • Soil is not one thing but rather a blend of many constantly changing components • Did you know that three to six different types of soil may be found in your backyard?

  4. Soil • What is in soil? • Sand – composed of silicates and is porous -Nutrients leech out easily -little ability to hold moisture • What does porous mean? • Why is this important? • It allows air and water to penetrate through the soil to reach plant roots

  5. Silt – made up of smaller particles - helps hold moisture and nutrients • Clay – made up of finely ground materials that cling together - rich in nutrients -Why can too much clay in soil cause problems? • Too much clay in soil will cause it to become impenetrable to moisture and air

  6. Organic Matter - decayed matter from plants and animals

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