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Rocks cover the entire Earth!

Dive into the world of rocks and discover what happens when rocks break. Discover why rock strength matters, how natural disasters can result from rock breaking, and how stresses like compressional, tensional, and shear forces can break rocks. Explore the impact of weathering caused by physical, chemical, and biological factors on rocks. Learn about the factors that determine rock strength, including rock type, texture, chemical composition, internal structures, and the presence of planes of weaknesses. Unveil the methods used to determine rock strength through sampling, special testing equipment, and observation techniques.

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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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