Mountain Building Chapter 11 February 28, 2011

Announcements Vocabulary for Chapters 9 and 11 is due on TODAY! TEST next Tuesday!

Exploratory Lab Get into groups of 2 or 3 Not 1, not 4… 2 or 3

Deformation Lab Write your prediction in the appropriate boxes: 1.Predict what will happen when you stretch out a rubber band. What will happen when you let it relax? 2.Predict what will happen when you pull on cold plastic putty. 3.Predict what will happen when you pull on warm plastic putty. 4.Predict what will happen when you bend the ends of a popsicle stick together.

Objectives 2/28/11 I will be able to… DESCRIBE THE FACTORS AFFECTING ROCK DEFORMATION I will be able to… DIFFERENTIATE BETWEEN THE TYPES OF STRESS CAUSING ROCK DEFORMATION

Key Points Deformation 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 Stress 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 bend or break Deformation refers to all _________________ _____________________________________ _ __________________ of a rock body Most deformation occurs along ______________ margins

Rock Deformation Deformation is the result of _________ Stress is the _________________________ that is acting on a solid When a rock is put under more stress than it can handle it will deform- usually by ______________, flowing, or _____________

Rock Deformation ____________________________ that is caused by stress on rocks is called __________ Factors influencing the strength of a rock and how it will deform: - Temperature- Rock types - Confining pressure- Time

Types of Deformation _________________deformation: rocks return to their _______________________________ when the force is removed – Stress is applied gradually _________________deformation: rocks split and __________________ – Temperatures and confining pressures are low ________________ deformation: rocks ___________________ their shape and size _____________________________ – Temperatures and confining pressures are high

Factors Affecting Deformation Temperature and Pressure – _______________ temperatures and pressure ______________the likelihood the rock will show _________________deformation Rock Type – Rocks with ____________________ usually show ________________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 ductile deformation if applied over a _____________________________________________

Types of Stress 1.______________- ______apart 2.______________- __________together 3.______________- top and bottom are pushed in ____________directions

Examples of Stress Brainstorm examples of the different types of stress from life: TensionalCompressionalShear

Check-in 1.Define deformation: 2.What are the 3 types of rock deformation? 3.What type of deformation involves rocks returning to their original shape and size after stress is removed? 4.What type of deformation involves rocks permanently changing shape without fracturing? 5.What are the three types of stress?

OBJECTIVES 3/1 I will be able to… CLASSIFY THE DIFFERENT TYPES OF MOUNTAINS _____________________________________ _ I will be able to… GIVE ___________________ ______________________ OF DIFFERENT TYPES OF MOUNTAINS

Key Points Anticlines, synclines, monoclines, faults, and joints are land features created as a result of ___________ and ___________________ The set of processes that produce mountains is called ___________________ Mountains are classified by __________________ The major types of mountains include: – ___________ mountains (result of _______________ _____________________) – _________________mountains (result of _________ ___________________) – __________________________ – ________________________mountains (result of the build up of volcanic materials)

Folds During mountain building, rock layers are often bent into a series of “ripples” called ___________ Types 1.Anticlines: ____________________ of rock layers 2.Synclines: _____________________in rock layers 3.Monoclines: __________________________________ in otherwise horizontal sedimentary rock layers

Folds

Monoclines

Faults ____________are fractures in the crust along which __________________has taken place The surface above the fault is called the _______________________ The surface below the fault is called the _______________________

Faults The major types of faults are 1._______________ faults 2._______________ faults 3.Reverse faults 4.Normal faults

Faults 1.Normal Faults -Occurs where the _________________________ ________________________________________ -Caused by _______________________________ 2.Reverse Faults -Occurs where the _________________________ ________________________________________ -Caused by _______________________________

Faults 3. Thrust faults - Occurs where the _____________________________ _____________________________________________ - Allow ______________________________________ of younger layers 4. Strike-slip faults - Occurs where the movement is mostly ____________ and _________________to the trend of the fault surface

Joints _____________________ along which ______________________ (detectable) ________________________has occurred

Joints

Mountains Why do all of these mountains look different Because different processes are responsible for their formation The collection of processes that produce mountains is called ________________________ Mountains are classified based on the ________________________________________ ________________________________________

Mountain Types FoldedDomes and Basins Fault-block Volcanic

Folded Mountains Formed primarily by ________________ Major force that causes formation is ______________________ Examples: _____________________________ _____________________________________ _____________________________________ __

Fault-Block Mountains Large-scale __________________________ ______________force ____________________________________ Horsts are uplifted structures bordered on either side by sunken in valleys called grabens Examples: ________________________________________ ________________________________________________

Domes and Basins When _________________produces a ___________________or elongated structure, the feature is called a __________________. – _________________________ are circular or elongated structures formed by uplifting of the underlying basement rock. – The Black Hills in SD are an example

Volcanic Mountains Formed when one plate ________________ under another, _________, and __________ rises to the surface Examples: _____________________________ _____________________________________ _

Objectives 3/2 I will be able to… DESCRIBE THE DIFFERENT TYPES OF MOUNTAINS THAT FORM AT DIFFERENT PLATE BOUNDARIES I will be able to… ANALYZE THE TYPES OF MOUNTAINS CREATED BY THE DIFFERENT PLATE BOUNDARIES

Key Points Different plate _______________________produce different types of ____________________because of how the lithosphere behaves ____________________are associated with _______________ and _______________mountains ______________________are associated with __________________ mountains Non-boundary mountains- formed from ____________________ Fragments of crustal material can collide with continental plates and become wedged on in a process called _________________

Plate boundaries Answer these questions before we continue on your check-in sheet 6. What are the three types of plate boundaries? 7. Of those three, which does not result in the destruction or formation of new lithosphere? 8. One of the three types of boundaries has 3 subtypes- what are those subtypes? 9. What are the three types of stress? Which is associated with each type of plate boundary?

Mountains at Convergent Boundaries __________________mountain building occurs at convergent plate boundaries ____________________forces from the colliding plates cause rock to _________, ____________, and _____________________ _____types of convergent boundaries - ______________- _______________ - ___________________

Mountains at Convergent Boundaries Ocean-Ocean Convergence – Produces mainly ___________________________ – One oceanic plate ______________under another – Examples: ________________________________ _________________________________________ _

Mountains at Convergent Boundaries Ocean-Continental Convergence – Produces mountains in ______, roughly ______________ belts In-land: _____________________ Closer to the sea: _____________________________ that produce _____________mountains ______________: a process that occurs when crustal fragments collide with and stay connected to continental plates

Mountains at Convergent Boundaries Ocean-Continental Convergence (Continued) Examples: _________Mountains of _____________________________

Mountains at Convergent Boundaries Continental-Continental Convergence – Since continental lithosphere is not dense enough to subduct, ________________________ are produced at C-C convergent boundaries – Examples: ____________________formed when __________collided with the ______________ plate

Mountains at Divergent Boundaries Divergent boundaries experience ____________________ stress This results in the formation of ______________________mountains Examples: Mid-Atlantic Ridge

Non-boundary mountains Mountains can also be formed places ______________ plate ______________ – _________________can create ______________ ______________________when lithosphere moves over them Example: ________________________________

Continental Accretion Pieces of crust can collide with and stick to continental landmasses _______________: a process that occurs when _______________________________ __________________________________ to continental plates – ________________of different ______________ ____________________ rocks combined with scraps of ____________ crust

Continental Accretion ___________________: crustal fragments with a geologic history that’s different from the fragments next to them – Example: The _______________of the US, ______ Mountains may result from the _________________forces that bring ________________________together with ______________________

Mountain Study Guide You’re going to make your own mini study guides to organize the information from today Fold your paper in half (“hamburger” style) Fold one of those halves in half again In the top portion, summarize mountain building at CONVERGENT boundaries – Include the 3 types, and an example of each In the middle portion, summarize mountain building at DIVERGENT boundaries – Include examples In the bottom portion, summarize mountain building at hot spots – Include an example On the back -In the top portion, summarize the three types of deformation and the three types of stress -In the middle portion, summarize folded and fault-block mountains -In the bottom portion, summarize domes and basins, and volcanic mountains