WU: What type of Boundary exists between the Nazca & South American Plate?

Wednesday 12-11-13 WU: • What type of Boundary exists between the Nazca & South American Plate? • What geologic features could you predict are found at this boundary?

To Do: • Check Boundary WS • Fold/Fault Notes & Activity • Folds and Faults WS

By the end of class you should be able to: • Explain & Model the formation of; -Anticlines, Synclines, & Monoclines -Normal Faults, Reverse Faults, & Transverse Faults • Describe which types of folds & faults are found at each type of boundary.

Folds & Faults Folds and faults are deformations in rock layers caused by the forces that squeeze, pull, or push on the rock.

Folds • Rock Bends but does not break

Use your hands to represent the formation of each type of fold. What type of stress would form these?

Faults • The stress is too much for the rock & it breaks. • You will see a crack in the rock. • The 2 sides of the crack will have shifted around the crack

Fault A Break in the rock due to stress.

2 Parts to a Fault What are the 2 sides of a fault called?

2 Parts to a Fault Footwall- the side of a fault that looks as if you could run up the incline. Hanging Wall- the side of a fault that is at a very steep incline and looks like someone could hang from it.

How to use footwalls and hanging walls to determine type of fault and therefore type of stress. • Find how the hanging wall moved in relationship to the footwall. • Think of a playground slide. Is it normal to go up or down a slide? • It is a normal fault if the rocks slid down the slide • It is a reverse fault if the rocks go up the slide.

Identify Type of Fault Reverse Fault – not normal to go up slide What force would cause this motion? (Force is needed to push it up the slide)

Normal Fault –normal to slide down slide What force would cause this motion? (Need to separate walls for it to slide down side)

Strike-Slip Fault – moving horizontally (sideways, not up or down) (Force is needed to push 2 plates in opposite directions laterally)

Complete your Fold & Fault Manipulatives using the cards. Call me over to check it when you think you have it all correct.

Folds & Faults WS

Can you: • Explain & Model the formation of; -Anticlines, Synclines, & Monoclines -Normal Faults, Reverse Faults, & Transverse Faults • Describe which types of folds & faults are found at each type of boundary.

Type of Fold or Fault • Type of Strain • Type of Boundary

To Read more about folds and faults as well as see examples click here: • http://www.eoearth.org/article/Folding_and_faulting_in_the_Earth's_crust?topic=50013

More Resources http://www.learner.org/interactives/dynamicearth/slip2.html http://geology.com/nsta/ http://www.mrenns.com/Docs-PowerpointsWeb/Ppoint-PlateBoundaries.pdf The End

WU: What type of Boundary exists between the Nazca & South American Plate?