Review of Forces int he Earth's Crust questions form class today. The question are glued in your spiral.
1. The 3 types of stress that can act on rock are tension, compression and shearing.
- Tension pulls on rock, stretching it so it become thinner in the middle.
- Compressions squeezes rock inwards so that it folds.
- Shearing causes two pieces of rock to slip past each other, moving in different directions.
2. The three types of faults we discussed are strike-slip faults, normal faults, and reverse faults.
- At strike skip faults there is no hanging wall or footwall and the 2 pieces of rock slip past each other.
- At normal faults the hanging wall slides downwards relative to the footwall that slides downwards.
- At reverse faults the hanging wall moves upwards relative to the footwall that moves downwards.
- Normal Fault: Tension is occurring (forces are pulling rock apart). This could occur at a divergent plate boundary.
- Reverse fault: Compression in occurring (forces push rock together). This could occur at a convergent plate boundary.
- Strike-slip fault: Shearing is occurring (force causes rocks to slip past each other). This could occur at a transform plate boundary.