Destructive Forces
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Destructive Destructive ForcesForces
Kristen EubanksKristen Eubanks
Lake Carolina ElementaryLake Carolina Elementary
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WeatheringWeathering
A physical or chemical process that breaks A physical or chemical process that breaks down rocks near the Earth’s surface.down rocks near the Earth’s surface.
Causes of weathering:Causes of weathering:• PlantsPlants• WaterWater• IceIce• Changes in TemperatureChanges in Temperature• Anything that causes rocks to wear or break Anything that causes rocks to wear or break
downdown
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WeatheringWeathering
http://www.uky.edu/AS/Geology/howell/goodies/elearning/module07swf.swf
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ErosionErosion
Movement of sediments by soil, wind, Movement of sediments by soil, wind, water or gravity.water or gravity.
http://science.nationalgeographic.com/science/photos/weathering-erosion-gallery.html
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LandslidesLandslides
The mass movements of land due to The mass movements of land due to gravity.gravity.
Can cause:Can cause:• Buildings to fallBuildings to fall• Power lines and gas tanks to breakPower lines and gas tanks to break
Can occur on the continental slope of Can occur on the continental slope of the ocean.the ocean.
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LandslidesLandslides
http://www.unoriginal.co.uk/footage10_3.html
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Volcanic EruptionsVolcanic Eruptions
Mountains with openings in the Earth’s Mountains with openings in the Earth’s crust through which magma, gases, and crust through which magma, gases, and ash reach the earth’s surface. ash reach the earth’s surface.
Eruptions can:Eruptions can:• Change the Earth’s surface on top of a Change the Earth’s surface on top of a
mountain.mountain.• Destroy fields and forests with lava and ash.Destroy fields and forests with lava and ash.• Change Earth’s weather patterns.Change Earth’s weather patterns.• Occur under oceans (called Seamounts)Occur under oceans (called Seamounts)
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Volcanic EruptionsVolcanic Eruptions
http://www.volcanovideo.com/p8vidclp.htm
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EarthquakesEarthquakes
Vibrations on the Earth’s surface caused by a Vibrations on the Earth’s surface caused by a sudden movement in Earth, often along a fault sudden movement in Earth, often along a fault or break in the Earth’s surface.or break in the Earth’s surface.
Some cause little damage while others cause a Some cause little damage while others cause a lot of damage.lot of damage.
Large quakes can cause landslides.Large quakes can cause landslides.
Earthquakes under the ocean can cause huge Earthquakes under the ocean can cause huge waves, tsunamis, that destroy land and cause waves, tsunamis, that destroy land and cause great damage when they come ashore.great damage when they come ashore.
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EarthquakesEarthquakes
http://video.google.com/videosearch?hl=en&q=earthquake&um=1&ie=UTF-8&sa=X&oi=video_result_group&resnum=5&ct=title#
http://earthquake.usgs.gov/
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FloodsFloods
A large amount of water covers land A large amount of water covers land that’s normally dry.that’s normally dry.
Flooding causes rapid erosion and Flooding causes rapid erosion and the soil and sediments to move the soil and sediments to move away. away.
When flooding goes away, a new When flooding goes away, a new sediment is left behind and can build sediment is left behind and can build up rich soil deposits.up rich soil deposits.
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FloodsFloods
http://www.ultimatechase.com/Flooding_Video.htm