Forces in Earths Crust Stress A force that

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Forces in Earth’s Crust

Forces in Earth’s Crust

Stress • A force that acts on an area of rock to change its

Stress • A force that acts on an area of rock to change its shape or volume.

There are 3 types of stress • Tension stretches rocks • Compression pushes rock

There are 3 types of stress • Tension stretches rocks • Compression pushes rock together • Shearing pushes the rock in two opposite directions

Questions • What type of landforms results from tension? • What type of landform

Questions • What type of landforms results from tension? • What type of landform results from compression?

Faults • When enough stress builds up in rock, the rock breaks, creating a

Faults • When enough stress builds up in rock, the rock breaks, creating a fault. • Most faults occur along plate boundaries

There are 3 kinds of faults • Normal Faults - Tension in crust pulls

There are 3 kinds of faults • Normal Faults - Tension in crust pulls rock apart. • Reverse Faults - Compression pushes rock together • Strike-Slip Faults – Shearing causes rocks to slip past each other

Mrs. Brown’s Fault Movie • http: //youtu. be/hfir 5 KQpu 6 c

Mrs. Brown’s Fault Movie • http: //youtu. be/hfir 5 KQpu 6 c

• Hanging Wall – The block of rock that is above the fault

• Hanging Wall – The block of rock that is above the fault plane • Footwall – The block of rock that is below the fault plane.

• In a normal fault, the hanging wall slips down relative to the

• In a normal fault, the hanging wall slips down relative to the footwall

• In a reverse fault, the hanging wall moves up relative to the

• In a reverse fault, the hanging wall moves up relative to the footwall

• San Andreas fault is a strike-slip fault with little up or down

• San Andreas fault is a strike-slip fault with little up or down motion

• The forces of plate movement can change a flat plain into anticlines,

• The forces of plate movement can change a flat plain into anticlines, synclines, folded mountains, fault-block mountains, and plateau.

Fault Block Mountain • When two normal faults cut through a block of rock,

Fault Block Mountain • When two normal faults cut through a block of rock, a fault block mountain forms.

• Q: Where in California are there fault-block mountains? A: The Sierra Nevada

• Q: Where in California are there fault-block mountains? A: The Sierra Nevada and Mojave Desert regions.

Plateau • A large area of flat land elevated high above sea level without

Plateau • A large area of flat land elevated high above sea level without much folding or faulting.

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