1. Sixth Grade Science
SOIL
Lesson 8

2. Earth’s Soil
Soil is the basis of life for all living things on Earth’s surface

3. Particles of weathered and eroded rock
Of What Is Soil Made?
Particles of weathered and eroded rock
Humus –once living plants & animals
Air
Water
Living organisms

4. Physical Rock Weathering
Mechanical weathering – rock changes shape , size, but is still the same material
Ice Wedging
Pressure Release
Plant root growth
Abrasion

5. Mechanical Weathering: Ice Wedging

6. Mechanical Weathering: Pressure Release/Exfoliation

7. Mechanical Weathering: Plant Root Growth

8. Mechanical Weathering: Abrasion

9. Chemical Weathering
Dissolving
Rusting

10. Chemical Weathering: Dissolving

11. Chemical Weathering: Rusting

12. Rock Particles In Soil Are Of Different Sizes
Gravel
Sand
Silt
Clay

13. Soil Layers
Soil Layers are called HORIZONS