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Unit 4 Factors impacting Earth Systems
Catastrophic Events
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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
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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
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Texas Ecoregions… include diverse ecosystems
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Texas Aquatic Ecosystems www.youtube.com/watch?v=WTdeuTGsEb0
Texas eco story Texas Ecosub regions 14 mins July 22, 2012 Footer text here
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Flood A rising body of water that submerges normally dry land.
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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
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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
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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
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July 22, 2012 Footer text here
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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
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July 22, 2012 Footer text here
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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
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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
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July 22, 2012 Footer text here
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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
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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
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The shape of the land can be changed by different factors
Catastrophic events cause…weathering, erosion and deposition July July 2015 July 22, 2012 Footer text here
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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
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Weathering… Mechanical/Physical Chemical Animal Burrowing Ice Wedging
Plant Roots Abrasion Chemical Oxidation Acids Rusting July 22, 2012 Footer text here
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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
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Erosion… To remove and transport sediment from one place to another
Caused by wind, water, glaciers and gravity July 22, 2012 Footer text here
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Deposition The process by which gravity, water, wind and ice deposit weathered and relocated sediment July 22, 2012 Footer text here
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Deposition can create Mountains Sand Dunes Beaches River Deltas
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Sediment Earth material broken down by weathering
Eroded and deposited by water, ice, wind and gravity July 22, 2012 Footer text here
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