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Rocks cover the entire Earth!

Rocks cover the entire Earth!. What happens when rocks break?. Why do we care about the strength of rocks?. Some natural disasters are caused by breaking rocks. Why do we care about the strength of rocks?. And, sometimes we break rocks on purpose!. What can break rocks?. Stress!.

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Rocks cover the entire Earth!

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  1. Rocks cover the entire Earth!

  2. What happens when rocks break?

  3. Why do we care about the strength of rocks? Some natural disasters are caused by breaking rocks.

  4. Why do we care about the strength of rocks? And, sometimes we break rocks on purpose!

  5. What can break rocks? Stress! There are many things in nature that cause stress. Pressure Force Area One cause is plate movements in the earth.

  6. What can break rocks? Stress! There are 3 types of stresses. 1. Compressional Stress

  7. What can break rocks? Stress! 2. Tensional Stress

  8. What can break rocks? Stress! 3. Shear Stress

  9. What can break rocks? Stress! Weathering also causes stress in rocks,resulting in rock breakage.

  10. What can break rocks? Stress! There are 3 types of weathering. 1. Physical • Wind • Water • Freezing • Repeated wetting & drying

  11. What can break rocks? Stress! 2. Chemical • Acid rain • Rust

  12. What can break rocks? Stress! 3. Biological • Tree roots • Animals • Human activity

  13. What does rock strength depend upon? • Type of rock • Texture of rock • Chemical composition • Internal structures • Fluids in rock

  14. What does rock strength depend upon? Planes of Weaknesses

  15. How do we determine rock strength? • Take samples • Use special testing equipment • Observe

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