Earthquakes and Volcanoes

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Presentation transcript:

Earthquakes and Volcanoes

Both usually happen near plate boundaries due to weaknesses in the lithosphere found there. Purple-Earthquakes, Red-Volcanoes http://endtimessigns.files.wordpress.com/2011/07/globalseis.jpg

Active Volcanoes around the world http://hsv.com/scitech/earthsci/quake.htm

Many are in the Ring of Fire, which surrounds the Pacific Ocean http://www.stardoves.com/U.S._Volcano-map_Ring_of-Fire2.gif

Earthquakes: Happen when pressure along a fault is released and the rocks move Occur at faults near boundaries Can be shallow or deep in the crust Measured on Richter scale http://i.livescience.com/images/i/2179/i02/050512_san_andreas_02.jpg?1296072122

Earthquakes cont.: Release tons of energy as waves Cause Ground to shift Buildings to collapse Pipes to break Tsunamis http://www.vagabondish.com/wp-content/uploads/new-zealand-earthquake-twisted-railroad-tracks-800x600.jpg

Volcanoes A weak place in the crust where magma rises to the surface Pressure builds in magma chamber until it blows Near boundaries and the Ring of Fire 600 active volcanoes w/ 50 eruptions a year http://worldlywise.pbworks.com/f/1272808249/volcanichazards.jpg

Release: Volcanoes cont.: Pumice Lava Gas Ash Earthquakes http://tiger.towson.edu/~mkime1/pyroclastic%20flows.jpg

Volcanoes cont.: Benefits: Created habitable atmosphere Fertile land (good for crops) Constructive process-builds land http://www.sciencephoto.com/image/167630/530wm/E3800402-View_of_Mayon_volcano_rising_above_farmland-SPL.jpg