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Effects of Weathering, Erosion and Deposition. WHAT IS AN ECOREGION?  Ecoregion - a major ecosystem with distinctive geography, characteristic plants.

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Presentation on theme: "Effects of Weathering, Erosion and Deposition. WHAT IS AN ECOREGION?  Ecoregion - a major ecosystem with distinctive geography, characteristic plants."— Presentation transcript:

1 Effects of Weathering, Erosion and Deposition

2 WHAT IS AN ECOREGION?  Ecoregion - a major ecosystem with distinctive geography, characteristic plants and animals, ecosystems, and receiving uniform solar radiation and moisture  Sometimes called an ecological region or bioregion  Smaller than a biome

3  Types of soil  Precipitation  Temperature  Land features  Vegetation  Animal wildlife

4 1. Weathering – chemical and physical break down of rocks into sediment 2. Erosion – the movement of sediment from one place to another 3. Deposition – the placement of sediment after being carried from place of origin

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6  Due to abundant precipitation and abundant vegetation that holds the soil in place, there is very little erosion.  Thick vegetation near rivers inhibits river erosion.

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8  Has gently rolling hills and lightly wooded plains.  This area generally receives a moderate amount of rainfall that helps shape the land.  Trees and grasses prevent large amounts of soil erosion due to water and wind.

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10  These areas have nutrient-rich soils and receive good amounts of rainfall through the year.  If the land is clear-cut of natural vegetation for construction, nutrients can easily be eroded.  If the land is used for farming and it is not managed well, nutrients will be quickly used up.

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12 WWave action, a cause of weathering, erosion and deposition, is constant along the Texas C oastline. SSediments are w eathered and e roded along beaches and carried out into the ocean to form s and bars and i slands. WWhen r ivers, like the Brazos enter the Gulf of Mexico s ediment being carried by the river s top moving and get d eposited causing a d elta.

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15  Soil in the region is primarily sand-based.  If there isn’t enough vegetation to keep the soil in place, rainfall received can cause severe erosion.  Catastrophic events such as hurricanes can increase wave erosion and deposition.

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17  The area is known as “Brush Country” due to the shorter trees and many shrubs.  Overgrazing of the land has allowed nutrient- rich topsoil to erode way.  Rocky, dry soil cannot support grasses, trees can thrive because of their deeper root system.

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19  Erosion has left most of the region with very shallow soils (less than 10 inches) lined with limestone rock layers.  High amounts of rain in a short amount of time can cause flash flooding.  Rainwater mixes with carbon dioxide in the atmosphere and soils to form carbonic acid, which acts to dissolve away limestone.

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22 TThe soil is not as prone to flooding because it allows water to infiltrate very easily. TThe region is described as rough, hilly terrain. EEnchanted Rock-Exfoliation has caused the rock to “peel” in sheets. This was caused by contracting and expanding during heating and cooling in the temperature. TThe weathering of sedimentary rock has exposed the granite dome underneath OOther types of mechanical weathering present – plant roots

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24  Soils in this area are most fertile and sought after for crop production.  Periods of drought and then sudden increase in rainfall causes large amounts of erosion and deplete the soil of nutrients.

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26  “ Texas Panhandle”-Largest and most completely flat areas of it size in the world!  The region extends to the Palo Duro Canyon-the nation’s 2 nd largest canyon.  Palo Duro Canyon was formed by water erosion from the Prairie Dog Town Fork of the Red River.  The water deepens the canyon by moving sediment downstream. Wind and water erosion gradually widen the canyon

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29  Rain does not fall evenly over the area. “Desert portion” of Texas.  The weathered bedrock in this area have a large amount of calcium. Erosion and deposition in the area creates soil which has high amounts of calcium called caliche.  Home of the tallest mountain in Texas, Guadalupe Peak. Elevation is 8,749 feet.  Pines and Oaks dominate the tree species.  Soils are shallow and rocky. Weathering continues to play a role in developing soil and will for thousands of years to come. Soils in the canyon bottoms and valleys are deeper as a result of deposition.

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32  Marine topography refers to the shape the land along coastlines, but they occur also in significant ways underwater.  The effectiveness of marine habitats is partially defined by these shapes, including the way they interact with and shape ocean currents.  Marine topographies include coastal and oceanic landforms ranging from coastal estuaries and shorelines to continental shelves and coral reefs.

33 Our Next Step:  Analyzed the characteristics of the ecoregions of Texas  Investigated processes that change the surface of the Earth  Explored how the process of weathering, erosion, and deposition have affected the environments in Texas ecoregion.


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