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Faults

Faults. By: Angie and Katherine. Earth’s crust. About 250 million years ago, the continents of Earth were grouped together in one continent called “Pangea.” It is just like the shell of an egg. Tectonic Plates.

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Faults

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  1. Faults By: Angie and Katherine

  2. Earth’s crust About 250 million years ago, the continents of Earth were grouped together in one continent called “Pangea.” It is just like the shell of an egg.

  3. Tectonic Plates • Land masses have moved and broken up and have reshaped the continents completely over millions of years ago. • It is like an egg shell that is cracked and put back together again. • It looks like the pieces of a jigsaw puzzle.

  4. Earth and an egg The Earth’s tectonic plates and egg’s shell are very much alike.

  5. Earth’s tectonic plate map Earth’s crust is broken into many tectonic plates. There are big and small plates.

  6. What causes tectonic plates to move? The tectonic plates float around the mantle. Which causes the tectonic plates to move.

  7. Plate and Shake! Stress that pushes rock past one another. The stress that is built up causes faults or cracks in Earth’s crust. When one plate pushes against another, stress builds up. There are three kinds of stress. They are compression, tension, and shearing.

  8. What are Faults? • Faults begin way below in the Earth. They start with a focus point. Then every year or so, it will grow an inch or two. BIG enough to be seen! • Above the focus point is called an epicenter. The place is usually where most damage happens. Do you know what it means ? A fault is a sudden break in the rocks that make up the Earth’s crust, also know as tectonic plates.

  9. Fault Lines • Cracks from faults create fault lines. • Some fault lines have split open the ground. • Large fault lines go deep underground and can stretch along a whole continent. • Many of earth’s major fault lines run along coastlines and across the ocean floor. • The world’s biggest fault lines are found near the edges of the Earth’s plate.

  10. San Andreas Fault Faults develop deep underground in the Earth’s crust. A few can be seen on the surface. One of the most famous is California’s San Andreas fault.

  11. What types of faults are there? There are three different types of major faults. The Normal Fault The Strike-Slip Fault The Reverse Fault/Thrust Fault

  12. A normal fault is a section of the crust when it moves apart, rocks are stretched until they snap. When they snap it causes one block to move down along a sloping crack. The Normal Fault

  13. The Reverse/Thrust Fault Hanging wall footwall When rocks come together, they are compressed. One block moves along a sloping crack when the other block moves down.

  14. The Strike-Slip Fault The strike-slip fault happens when rocks grind against each other, they move horizontally past each other in opposite directions. Just like two lanes of cars, and they go opposite sides!

  15. Results of the faults

  16. Normal FaultStress that pulls rocks apart The hanging wall drops, tension is the stress.

  17. Reverse faultCompression pushes rocks together The hanging wall moves up relative to the footwall.

  18. Strike-Slip faultStress that pushes rock past one another The fence was broken and offset 8 feet by the moving of a strike-slip fault. The bed for planting slip apart.

  19. Bibliography • “Earthquakes.” [Online] Available • http://www.studyblue.com, January 29, 2014. • “Earthquakes and Seismology.” [Online] Available • http://www.ucl.ac.uk/EarthSci/Earthquakes.htm, January 28, 2014. • “Earth’s tectonic plates.” [Online] Available • http://www.windows2univers.org, January 26, 2014. • “Faults.” [Online] Available • http://www.smate.wwu.edu, January 29, 2014. • Hawkins, John. Earthquake Disasters. New York: The Rosen Publishing Group, Inc., 2012. • “How do rocks deform?” [Online] Available • http://www.geoscience.wisc.edu, September 26, 2013. • Lynch, K. David. “San Andreas Fault.” [Online] Available • http://www.SanAndreasFault.org, 2009.

  20. Bibliography • Morris, Neil. Earthquakes. New York: Crabtree Publishing Company, • 1998. • OfficeManager. “Fault Lines in Texas.” [Online] Available • http://www.dawnsonfoundation.com/fault-lines-texas, September 5, 2013. • “Plate Tectonics.” [Online] Available • http://www.geology.uprm.edu, January 25, 2014. • “Reverse Faults” [online] Available • http://www.artinaid.com/components-and-types-of-geological-faults, April 2013. • Sipiera, P. Paul. Earthquakes. New York: Children’s Press, 1998. • Thoron, Joe. Earthquakes. Malayasia: Marshall Caverdish Corporation, 2007. • Walker, M. Sally. Earthquakes. Minneapolis: Carolrhoda Brooks, Inc., 1996. • Woods, Michael and, Woods, B. Mary. Earthquakes. Minneapolis: Learner Publications • Company, 2007.

  21. Thank you for watching! We hope you’ve enjoyed the presentation!

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