Unit 4 Factors impacting Earth Systems Catastrophic Events

Catastrophic Events Extreme weather events such as floods, volcanic eruptions, hurricanes, forest fires , earthquakes and tornadoes; classified by the extent and intensity of their impact on the ecosystem Change the features of the earth July 22, 2012 Footer text here

Ecosystem A system consisting of all the interactions that occur between the abiotic and biotic factors within an environment. July 22, 2012 Footer text here

Texas Ecoregions… include diverse ecosystems July 22, 2012 Footer text here

Texas Aquatic Ecosystems www.youtube.com/watch?v=WTdeuTGsEb0 Texas eco story www.youtube.com/watch?v=4TBdbYWaByI Texas Ecosub regions 14 mins www.youtube.com/watch?v=5hqRdebJRtg July 22, 2012 Footer text here

Flood A rising body of water that submerges normally dry land. July 22, 2012 Footer text here

www.youtube.com/watch?v=G6bSrSLSN8A&feature=em-share_video_user July 22, 2012 Footer text here

Tornado A violently rotating column of air extending from a thunderstorm to the ground with wind speeds from 40 to 318 mph. July 22, 2012 Footer text here

www.youtube.com/watch?v=q54OSjucWSc July 22, 2012 Footer text here

Hurricane A powerful rotating storm that forms over the ocean with wind speeds from 74 to 249 mph. In the Northern Hemisphere rotates counterclockwise Is fueled by warm ocean water July 22, 2012 Footer text here

www.youtube.com/watch?v=LG3K-pxPDEk July 22, 2012 Footer text here

Forest Fire A wildfire or wild land fire is an uncontrolled fire in an area of combustible vegetation that occurs in the countryside area. Other names such as brush fire, bush fire, forest fire, desert fire, grass fire, hill fire, peat fire, vegetation fire and  may be used to describe the same phenomenon depending on the type of vegetation being burned,  July 22, 2012 Footer text here

www.youtube.com/watch?v=pqr2DNaMLiQ July 22, 2012 Footer text here

Earthquake A sudden movement of the earth's crust caused by the release of stress accumulated along geologic faults or by volcanic activity.  A tremor of the surface of the Earth, sometimes severe and devastating, which results from shock waves generated by the movement of rock masses deep within the Earth, particularly near boundaries of tectonic plates July 22, 2012 Footer text here

www.youtube.com/watch?v=-yu9Ah64gFU July 22, 2012 Footer text here

Tsunami A large wave on the ocean, usually caused by an undersea earthquake, a volcanic eruption, or coastal landslide. A tsunami can travel hundreds of miles over the open sea and cause extensive damage when it encounters land July 22, 2012 Footer text here

www.youtube.com/watch?v=fTn0UWMXpgo July 22, 2012 Footer text here

Volcanic Eruption Volcanic eruptions happen when lava and gas are discharged from a volcanic vent. The most common consequences of this are population movements as large numbers of people are often forced to flee the moving lava flow. Volcanic eruptions often cause temporary food shortages and volcanic ash landslides called Lahar.  July 22, 2012 Footer text here

www.youtube.com/watch?v=oowDvy-wtj4 www.youtube.com/watch?v=R0Zbj7S22zs July 22, 2012 Footer text here

Topography A description of land surface area with reference to elevation variations The highs and lows of the land The shape/curves of the land July 22, 2012 Footer text here

Topographic Map… . is a detailed map of the surface features of land. . It includes the mountains, hills, creeks, and other bumps and lumps on a particular hunk of earth. July 22, 2012 Footer text here

www.youtube.com/watch?v=K-UXrpAjyl0 July 22, 2012 Footer text here

The shape of the land can be changed by different factors Catastrophic events cause…weathering, erosion and deposition July 2014 July 2015 July 22, 2012 Footer text here

Weathering… processes that break rock into smaller pieces Physical/ Mechanical weathering… Rocks breaking apart without changing their chemical composition.  By wind, rain, ice or gravity/pressure July 22, 2012 Footer text here

www.youtube.com/watch?v=CMm5RG4vUXo July 22, 2012 Footer text here

Weathering… Mechanical/Physical Chemical Animal Burrowing Ice Wedging Plant Roots Abrasion Chemical Oxidation Acids Rusting July 22, 2012 Footer text here

Cave with no name…Boerne Texas Chemical weathering… the erosion or disintegration of rocks, building materials, etc., caused by chemical reactions Ex. Carbonation a type of chemical weathering. Carbonation is the mixing of water with carbon dioxide to make carbonic acid. This type of weathering is important in the formation of caves. *Texas caves are formed from Limestone that chemically weathered July 22, 2012 Footer text here

www.youtube.com/watch?v=6VnVRHIV6j4 July 22, 2012 Footer text here

Erosion… To remove and transport sediment from one place to another Caused by wind, water, glaciers and gravity July 22, 2012 Footer text here

www.youtube.com/watch?v=G5Rp9MJJGCU July 22, 2012 Footer text here

Deposition The process by which gravity, water, wind and ice deposit weathered and relocated sediment July 22, 2012 Footer text here

Deposition can create Mountains Sand Dunes Beaches River Deltas July 22, 2012 Footer text here

www.youtube.com/watch?v=g65_MgWaBoM July 22, 2012 Footer text here

Sediment Earth material broken down by weathering Eroded and deposited by water, ice, wind and gravity July 22, 2012 Footer text here

www.youtube.com/watch?v=AE771AdF5dM July 22, 2012 Footer text here

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