The video discusses the different types of forces that can act on and deform the Earth's crust, including compression, tension, and shearing. Compression causes squeezing and folding of rocks to form structures like anticlines and synclines. Tension causes pulling apart and thinning of the crust to form rift valleys. Shearing causes twisting and tearing of rocks. Different rock types and environmental conditions influence whether the crust folds or faults under geological forces.
2. I. Crust – the surface layer of the earth
A. Continental: land not under the oceans
B. Average of 32km, but can be as thick as
70km
II. Oceanic
A. Ocean floor
B. Average of 8km thick
Review: Which one is denser?
3.
4. a. The forces that
pull and push on
the earth’s crust
b. Causes
deformation – the
tilting, breaking or
folding of rock
9. c. Fracture – cracks in rocks
d. Fault – crack along which rocks move
sideways, up, or down.
i. Fault block mountains form from the
normal faults pushing up rock
ii. Rift valleys form when land between
normal faults slide down
10.
11. e. Folding – a bend in the rock
i. Anticline – an upward fold
ii. Syncline – a downward fold
iii. Appalachian mountains are made from
folds
12.
13. i. Higher temperatures will cause folding/lower
temps. cause faulting
ii. Greater pressure causes folding/lower
pressure causes faulting
Rock type
iii. Brittle rock will more likely fault
iv. Ductile (bendable) rock will more likely fold
v. Pressure applied gradually will cause
folding/fast will cause faulting
