Destructive Destructive ForcesForces

Kristen EubanksKristen Eubanks

Lake Carolina ElementaryLake Carolina Elementary

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

WeatheringWeathering

http://www.uky.edu/AS/Geology/howell/goodies/elearning/module07swf.swf

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

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.

LandslidesLandslides

http://www.unoriginal.co.uk/footage10_3.html

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)

Volcanic EruptionsVolcanic Eruptions

http://www.volcanovideo.com/p8vidclp.htm

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.

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/

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.

FloodsFloods

http://www.ultimatechase.com/Flooding_Video.htm