Earths Crust in Motion When the Earths plates
- Slides: 36
Earth’s Crust in Motion
• When the Earth’s plates are in motion, earthquakes may occur. • Tier Word • Motion-movement.
STRESS • The movement causes stress in the crust. • There are 3 types of stress in the crust • Stress -pressure
Musical sliders
Tensional Stress (gum)
Compressional Stress
What happens during an earthquake? • The stress builds and then releases. This is the energy in an earthquake. • An earthquake is the shaking and trembling that is caused by the movement of rock beneath Earth’s surface.
Faults • Earthquakes are caused by stress at fault lines. • A fault line is found at the boundaries of two different lithospheric plates. • (it’s the faults fault! ) • haaaaaa
Strike slip fault • Caused by shearing • Rocks slip past each other • San Andreas Fault
• Normal faults -the land is pulling apart or stretching. • The tension in the crust increases until the rocks fracture. • One block of land slips downward • Fracture-break
Reverse Forms by compression hanging wall slides up and over footwall Formed Appalachian Mountains (Thrust) Fault
• http: //www. iris. edu/gifs/animations/faults. ht m
• http: //science. howstuffworks. com/nature/n atural-disasters/earthquake 3. htm
Safety Tips • • • Have an earthquake readiness plan. make your home sturdier, such as bolting bookcases to wall studs, installing trong latches on cupboards, and strapping the water heater to wall Locate a place in each room of the house that you can go to in case of an earthquake. It should be a spot where nothing is likely to fall on you. Keep a supply of canned food, an up-to-date first aid kit, 3 gallons (11. 4 liters) of water person, dust masks and goggles, and a working batteryoperated radio and flashlights. Know how to turn off your gas and water mains. .
Mountain Building • Takes millions of years • Caused by compression/converging forces • Formed by folding –bends in rock that form when compression shortens and thickens part of Earth’s crust
Mountain Building Cont. • Syncline • Anti-cline • Plateau dip = peak rock bends into an arch =large area of flat land elevated high above sea level
Colorado Plateau
Folding
upward fold
Syncline
Syncline
folded arched rock
Anti-Cline-fold
Tier words to Know for the Test and Beyond • • Compress -squeeze Geologic event (earthquakes, volcanoes) • • • Interior-inside Motion -movement Anything that starts with the prefix geo-earth Volcanologist- studies volcanoes Seismologist- studies earthquakes Diverge -separate Converge- come together Transform- slip past Stress –pressure/tension
Students Stop Here
Teacher notes
Questions to Think About Essential Questions: • Can we predict earthquakes? Can we predict when volcanoes will erupt? • What do earthquakes and volcanoes tell us about what is happening inside the earth and on the surface? • Do you have to worry about a volcanic eruption or • earthquake where you live? Why or why not?
What students need to know for the long run – Unit Enduring Understandings: – Studying historical earthquakes and volcanic eruptions improves our understanding of earth's processes. – Although it is known where earthquakes and volcanic eruptions are likely to happen, there is currently no reliable way to predict precisely when an event will occur. – Volcanoes and earthquakes indicate the high temperatures and pressures that exist in earth's interior. – Volcanism(volcanic activity) and seismic(earthquake) activity vary across the globe
Common misunderstandings • • • What do students typically misunderstand? Earthquakes don’t only occur when whole plates slide past each other. Earthquakes don’t create a gap or hole in the earth's surface. Earthquakes don’t occur at one depth. Lava that erupts out of a volcano does not comes from earth's core. Earthquakes don’t cause volcanic eruptions. Plate boundaries are not the same as faults. Lava does not come out of all volcanic eruptions
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- Plasticity in earth's layers
- Which layers together constitute the lithosphere
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- Earths major crustal plates
- My plate
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- Brown earth soil ireland
- Earths roation
- Earths layers definition
- Which layer of the earth slowly moves like putty
- Earths boundaries
- Continental drift theory
- Whats earths moon called
- What is this shape
- Earths early atmosphere contained
- Study of the earth's physical features
- Earths 4 spheres
- Earths interior
- Earths biomes
- Arch of constantine reliefs
- Earths orbit seasons
- Earth's honey fertilizer
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- What does the earths tilt cause
- Whats earths moon called
- What does earths tilt do
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- Lithosphere
- Continental crust composition
- Mantle is made up of
- Distrophism
- Earth's dynamic crust and interior topic 12
- What is the crust
- Texbook
- Labelled diagram
- Most abundant minerals in earth's crust