objective 10-28-15: analyze the characteristics of the ecoregions of texas investigate processes...
TRANSCRIPT
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Objective 10-28-15:Analyze the characteristics of the ecoregions of TexasInvestigate processes that change the surface of the EarthExplore how different types of soil, rocks, and vegetation affect weathering and erosion
Warmup: look over page 217-218 and gently remove it from your textbook for turn in.
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Ecoregions of Texas
And the effects of weathering,erosion,
and deposition
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Factors Affecting Our Ecoregions
Weathering – chemical and physical break down of rocks into sediment
Erosion – the movement of sediment from one place to another
Deposition – the placement of sediment after being carried from place of origin
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What is an ecoregion?
• A relatively large unit of land or water that is characterized by a distinctive climate, ecological features, and plant and animal communities
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Regions of Texas• 1 – High and Rolling Plains• 2 – Oak Woods and Prairies
and Blackland Prairies • 3 – Pineywoods• 4 – Gulf Coast Prairies and
Marshes and Coastal Sand Plains
• 5 - South Texas Brush Country• 6 –Edward’s Plateau and
Llano Uplift• 7 – Trans Pecos
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What is the topography of the ecosystems? What effect could that have on erosion and deposition?
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What effect do the rock types have on erosion and deposition?
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Which ecoregions have the most precipitation? What effect could that have on vegetation?
On erosion and deposition?
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High and Rolling Plains“The Panhandle”
• Mostly flat and grassy • Mostly treeless• On a high, flat plateau• The eastern portion is not
as flat and is brushy• Includes deep canyons
carved by rivers• Average regional rainfall
15-28 inches a year
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Palo Duro Canyon – “Grand Canyon of Texas” formed by one of the forks of the Red River
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Oak Woods & Prairies and Blackland Prairies
• Transition between plains of the Panhandle and the Pineywoods of East Texas
• Patches of woodland sprinkled throughout a grassland prairie
• Gently rolling to hilly• Rich, fertile and black soil• Average regional rainfall
– 26-40 inches per year
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Pineywoods“East Texas”
• Primarily thick pine forest• Larger forest extents into
Louisiana, Arkansas, and Oklahoma
• Rolling terrain with wet bottomlands
• Swamps are common especially in the “Big Thicket”
• Average regional rainfall 40-52 inches per year
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Gulf Coast Prairies and Marshes and Coastal Sand Plains
• Bays, marshes, and barrier islands
• Estuaries (salt and fresh water meet)
• Prairies and grasslands as you travel west
• Houston is a part of this ecoregion
• Average regional rainfall 40-60 inches per year
• Can have extensive flooding from storms and hurricanes
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South Texas Brush Country
• Runs from edges of the Hill Country to the Lower Rio Grande Valley
• Mostly dry and covered with grasses and thorny brush such as mesquite and prickly pear cacti
• Average regional rainfall 20-32 inches per year
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Edward’s Plateau and Llano Uplift“The Hill Country”
• High flat land (plateau) eroded into hilly terrain
• Many springs and steep canyons
• Underground lakes in the Edward’s Aquifer area
• Caves• Average regional rainfall
15-34 inches per year
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Trans Pecos“West Texas”
• Region of extremes• Hot dry desert that is cool
at night• Mountains – occasionally
snows in winter• Forests grow on slopes• Rio Grande River runs
through forming a border between Texas and Mexico
• Average regional rainfall 8-20 inches per year