REVIEW OF WEATHERING AND EROSION

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Presentation transcript:

REVIEW OF WEATHERING AND EROSION

WHAT WORD(S) SIMPLY DESCRIBE “WEATHERING” Breaking down Remember this is different from erosion There are two types of weathering: CHEMICAL AND MECHANICAL

CHEMICAL WEATHERING CARBON DIOXIDE DISSOLVE IN WATER ACID RAIN OXIDATION ORGANISMS

MECHANICAL WEATHERING PLANTS ABRASION ANIMALS RELEASE OF PRESSURE TEMPERATURE CHANGE

WHAT WORD(S) WOULD SIMPLY DESCRIBE “EROSION” MOVEMENT Erosion occurs after weathering Types of erosion include: WATER/ICE WIND GRAVITY

EROSION WATER WIND GRAVITY

NEW IMPORTANT TERM…

Principle 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).

Deposition and the Weathering-Erosion-Deposition Cycle (WED Cycle)

What is Deposition? START WIND EROSION FINISH DEPOSITION The process in which sediment is laid down in new locations. WIND EROSION FINISH START DEPOSITION

What causes Deposition? All the types of erosion: water, wind, gravity, etc.

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.

WED CYCLE WEATHERING EROSION DEPOSITION

WED CYCLE BEATS UP ROCKS MOVES ROCKS DROPS ROCKS IN NEW PLACE

Here is a section of the Earth’s surface 100,000 years ago. There is a mountain and a nice little lake.

Here is the same section after 10,000 years after weathering, erosion, and deposition have occurred.

Here is the same section today; weathering, erosion, and deposition have occurred and will continue to occur.

Consider this…

The Appalachian mountains are the oldest mountains in the world. They were formed 300 million years ago. The Rocky Mountains were formed between 65 and 100 million years ago. The highest part of the Appalachian Mountains 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?