4.3 Agents of Erosion and Deposition Unit 4: Weathering, Erosion, Deposition and Landscapes January 10, 2012 Sanders

Unit 4: Weathering, Erosion and Landscapes Do Now: Define Abrasion Deflation Sorted (deposits) Striations Till Unsorted (deposits) April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Main Topics The following are related to Earth’s materials. Weathering: to break down Earth’s materials Erosion: to carry away Deposition: to leave behind April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Weathering is the break down of Earth’s surface. Infer: What type of weathering caused this?  Notice at right, the material has been weathered and the resulting sediment remains April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Erosion refers to Earth’s weathered material being taken away. What is going on in this picture? At left, a house on the cliff is in immanent danger of falling into the water. April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Deposition Deposition refers to eroded material being left behind. Where is the deposition in this picture? At right shows material being deposited as the river slows. April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Agents of Erosion & Deposition In the following, we will look at different agents that erode the earth. These agents also deposit material in a very specific way. April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Running Water Running water pushes particles along a channel. These particles tumble against each other. If a stone starts out sharp and angular, what happens? April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Running Water When the velocity of the water decreases, particles settle out. Larger, rounder or more dense particles will settle out first. A car is buried in mud after flooding in Highland, California. April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Wind Wind pushes particles along by having one particle bound into another. It is sort of like playing pool. At left is a hoodoo carved by wind in the Black Hills of South Dakota. April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Wind Like water, when the velocity wind is diminished, the larger, rounder and more dense particles settle first. This is called sorted deposition. April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Glaciers Glaciers move material in its path like a giant bulldozer. All loose material gets moved. April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Glaciers When glaciers melt, they leave behind piles of unsorted material called moraines. The soil that got moved is called till. April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Glacial Moraine April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Saltation April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Gravity Gravity pulls material toward the center of the Earth. Mud slides Rock slides Land slides Simple Collapse April 8, 2019 Unit 4: Weathering, Erosion and Landscapes

Unit 4: Weathering, Erosion and Landscapes Gravity Material at the bottom of the slope is called a talus slope. This is unsorted deposition. April 8, 2019 Unit 4: Weathering, Erosion and Landscapes