review of weathering and erosion. what word(s) simply describe weathering breaking down remember...
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REVIEW OF WEATHERING AND EROSION
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WHAT WORD(S) SIMPLY DESCRIBE “WEATHERING”
• Breaking down
• Remember this is different from erosion
• There are two types of weathering:
CHEMICAL AND MECHANICAL
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CHEMICAL WEATHERING ACID RAIN
DISSOLVE IN WATER
CARBON DIOXIDE
ORGANISMS OXIDATION
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MECHANICAL WEATHERINGABRASION
PLANTSANIMALS
TEMPERATURE CHANGE
RELEASE OF PRESSURE
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WHAT WORD(S) WOULD SIMPLY DESCRIBE “EROSION”
• MOVEMENT
• Erosion occurs after weathering• Types of erosion include:
WATER/ICEWINDGRAVITY
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EROSIONWATER WIND
GRAVITY
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NEW IMPORTANT TERM…
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Principle of UniformitarianismPrinciple of Uniformitarianism
• States that the same processes that operate today operated in the past.
• All the types of weathering and erosion we’ve studied that occur today have ALWAYS BEEN OCCURRING since the beginning of the Earth.
• A principle is basically a LAW (description of how nature works).
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Deposition and the Weathering-Erosion-Deposition
Cycle(WED Cycle)
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What is Deposition?What is Deposition?
• The process in which sediment is laid down in new locations.
WINDWINDEROSION
EROSIONFINISHFINISH
STARTSTART
DEPOSITIONDEPOSITION
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What causes Deposition?What causes Deposition?
• All the types of erosion: water, wind, gravity, etc.
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What is the WED cycle?What is the WED cycle?
• The Cycle of Weathering, Erosion, and Deposition that occurs now and has been occurring all around the world at all times.
• Because of this cycle, the Earth’s surface has changed greatly over time.
• It is what fills in lakes, shortens mountains, made the grand canyon, etc.
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WED CYCLEWED CYCLE
WEATHERING
EROSION
DEPOSITION
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WED CYCLEWED CYCLE
BEATS UP ROCKS
MOVES ROCKS
DROPS ROCKS IN NEW PLACE
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Here is a section of the Earth’s surface 100,000 years ago. There is a mountain and a nicelittle lake.
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Here is the same section after10,000 years after weathering,erosion, and deposition haveoccurred.
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Here is the same sectiontoday; weathering, erosion,and deposition haveoccurred and will continue to occur.
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Consider this…
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The Appalachian mountains are the oldest mountains in the world. They were formed300 million years ago. The Rocky Mountains were formed between 65 and 100 million years ago. The highest part of the AppalachianMountains is Mt. Mitchell (in North Carolina) at 6,684 ft. The highest part of The Rocky Mountains is Mt. Elbert (in Colorado) at 14,440 ft. Can you explain why?