Rocks cover the entire Earth!

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Presentation transcript:

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!

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

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

What can break rocks? Stress! 2. Tensional Stress

What can break rocks? Stress! 3. Shear Stress

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

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

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

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

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

What does rock strength depend upon? Planes of Weaknesses

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