Understanding Crust Deformation: Forces, Stress, and Isostatic Adjustments
The Earth's crust undergoes various forms of deformation such as bending, tilting, and breaking due to forces like compression, tension, and shearing. Isostatic adjustments play a role in areas with mountain ranges, causing the crust to bend up and down. As mountain ranges erode, the crust lightens and rises, influenced by factors like river systems and glacier melting.
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Chapter 5 Deformation of the Crust 5.1 How is the crust deformed? Deformation - the bending, tilting, and breaking of the earth s crust Turn to text page 83
Isostatic adjustment Isostasy the balance between the forces of the crust pressing down on the mantle, and the mantle pressing up on the crust Isostatic adjustments cause the crust to bend up and down Why do isostatic adjustments constantly occur in areas with mountain ranges?
Mountain ranges erode. As the crust lightens, area rises Rivers can carry large amounts of mud, sand, and gravel. Glaciers melt, so crust rises
Stress Stress force that causes pressure in the rocks of the crust Compression Rocks are squeezed together Tension Force that pulls rocks apart Shearing Push rocks in opposite directions Turn to text page 84
Identify the stress forces on the rocks below... Tension Shearing
Identify the stress forces on the rocks below... Tension Shearing Tension
Identify the stress forces on the rocks below... Tension Shearing Tension Compression
