Download - Landscape Development & Environmental Change
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Landscape Development
& Environmental Change
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• Landscapes: the features of Earth’s surface
• Stream Drainage: the shape of the stream in an area
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Mountains, Plateaus, & Plains• Based on gradient, elevation, & rock structure.
• Mountains: high elevation, steep gradient, and distorted rock structures.
Adirondack Mountains, NY
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Mountains, Plateaus, & Plains• Plateaus: high elevation, flat slope, undistorted
horizontal rock structure.
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Mountains, Plateaus, & Plains• Plains: low elevation, flat surface, usually
sedimentary rocks
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Landform Regions of the Unites States
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Factors of Landscape Development• Uplifting forces and leveling forces can form and
change landscapes.– Impact events can also change landscapes.
• Sources of energy:– Uplifting: heat from Earth’s interior / mantle
convection– Leveling: insolation & gravity
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Time & Landscape Changes• Landscape features
depend on the length of time that uplifting and leveling forces have acted on the rocks.
• Dynamic Equilibrium: at any one time, landscape features reflect a state of balance.
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Climate and Landscape Development
• Landscapes are influenced by:– Temperature– Moisture
• Arid Climates– Steep slopes, and sharp, angular landscape features.– Sandblasted features
• Humid Climates– More rounded, smooth landscape features
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Arid climate
Humid climate
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Climate and Landscape Development• Recent Glaciation
Landscape Features: – Mountaintops with
little soil– Widespread
transported soil– Unsorted soil– Wide, U-shaped valleys– Many lakes– Parallel grooves in
bedrock– Many small hills
(drumlins, etc.)
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Climate and Landscape Development
• Soil and Climate: – Soils in arid regions are thin/nonexistent, sandy, and
contain many minerals.
These trees are growing in an arid climate.
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Bedrock• The composition and structure of bedrock can
affect the landscape in a region.• Rock types and hill slopes:
1. Structural Features: folds, faults, etc. can lead to many changes in landscape features in an area.
2. Streams: the direction, drainage pattern, features, and gradient of a stream are directly related to bedrock.
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Bedrock• Rock types and hill slopes:
3. Soils: differences in soil composition are due to differences in underlying bedrock.
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Effect of Landscapes ON People• Streams and Rivers– Dangerous flooding
• Ocean shores– Dangerous flooding, hurricanes, rise in sea level
• Clay-rich areas– Slow mass movement; landslides, liquefaction during
earthquakes
• Dangers can be reduced with proper planning, laws, and zoning limitations.
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Changes of Landscapes BY People• Humans have GREATLY affected the environment:
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Changes of Landscapes BY People• Human population increasing RAPIDLY– Landscape pollution is HIGHEST in areas with HIGH
population density.