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Mountain Building . Chapter 11 September 29, 2010. Complete the following using Ch . 11 of your textbook (page 308 ) on your warm up doc: Define deformation Define stress Define strain List the three types of deformation List the three types of stress

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### Mountain Building

Chapter 11

September 29, 2010

Complete the following using Ch. 11 of your textbook (page 308) on your warm up doc:
• Define deformation
• Define stress
• Define strain
• List the three types of deformation
• List the three types of stress
• Which type of fault (p. 312) could result in having older rock layers on top of younger rock layers?
Exploratory Lab
• In groups, you are going to complete the Inquiry Activity on page 307
• Be careful with the sticks- if you do not behave maturely, you will not be allowed to do labs
Objectives 9/29/10
• I will be able to… DESCRIBE THE FACTORS AFFECTING ______________________
• I will be able to… DIFFERENTIATE BETWEEN THE ________________CAUSING ROCK DEFORMATION
Key Points
• __________occurs when there is a change in the size and/or shape of a rock body
• Deformation is caused by movements of tectonic plates and interactions at plate boundaries
• Types of deformation: ductile, elastic and brittle
• _______is the force per unit area that is acting on a solid
• Types of stress: compressional, tensional, shear
• Strain is the change in shape of a rock as a result of stress
Rock Deformation
• Rocks are strong- but no matter how strong, there is a point when rocks will ____________
• Deformation refers to __________________ _____________________________________
• Most deformation occurs along _____margins
Rock Deformation
• Deformation is the result of ________
• Stress is the ________ per unit area that is acting on a solid
• When a rock is put under more stress than it can handle it will deform- usually by _______ _____________________
Rock Deformation
• The ____________ that is caused by stress on rocks is called _____________
• Factors influencing the strength of a rock and how it will deform:
• ____________
• ___________types
• Confining ____________
• ___________
Types of Deformation
• ______deformation: rocks _______to their original size and shape when the force is removed
• Stress is applied ____________
• _______deformation: rocks _______and fracture
• Temperatures and confining pressures are ______
• _____________deformation: rocks change their shape and size _________________
• Temperatures and confining pressures are _______
Factors Affecting Deformation
• Temperature and Pressure
• __________temperatures and pressure increase the likelihood the rock will show __________deformation
• Rock Type
• Rocks with _______bonds usually show brittle deformation
• Sedimentary and foliated metamorphic rocks are more likely to show ductile deformation
• Time
• Forces that might not deform a rock at first can cause a rock to show _______deformation if applied over a long period of time
Types of Stress
• _________ - pull apart
• __________ - squeeze together
• _______ - top and bottom are pushed

in different directions

Types of Stress
• Can you think of some examples of each type of stress?
• Tensional
• Compressional
• Shear
Examples of Stress
• Brainstorm examples of the different types of stress from life: (at least 3 types for each)

Tensional

Compressional

Shear

Examples of Stress
• Choose one example from the list for each type of stress.
• Write 2 sentences explaining the affect the stress has in each example.
Predicting Stress
• PREDICT what sort of affect each of those types of stress might have on a mountain being formed.
• Write 2 sentences explaining the affect each type of stress might have on a new mountain.
Check-in
• Define deformation:
• What are the 3 types of rock deformation?
• What type of deformation involves rocks returning to their original shape and size after stress is removed?
• What type of deformation involves rocks permanently changing shape without fracturing?
• What are the three types of stress?