and the effects of weathering,erosion, and deposition · and coastal sand plains • bays, marshes,...
TRANSCRIPT
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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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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