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2-28-11 Aim: What is Deposition?

2-28-11 Aim: What is Deposition?. Do Now: What type of climate favors physical vs. chemical weathering? HW: Start studying Topics 9&10 for exam on Thursday. Deposition is the dropping off of sediments as a result of the erosional agent slowing down or stopping.

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2-28-11 Aim: What is Deposition?

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  1. 2-28-11Aim: What is Deposition? Do Now: What type of climate favors physical vs. chemical weathering? HW: Start studying Topics 9&10 for exam on Thursday.

  2. Deposition is the dropping off of sediments as a result of the erosional agent slowing down or stopping. • Characteristics of sediments and rate of deposition: • 1. Size- Bigger sediments settle out faster than smaller sediments. • 2. Shape- More spherical sediments settle out faster than angular ones. • 3. Density- Denser sediments settle out faster that less dense ones. • *Settling rate is the speed at which sediment settles and Settling Time is the time it takes for particles to settle from top to bottom. ** The faster the settling rate the shorter the settling time.

  3. Sorting of Sediments and Deposition • Sediments will sort if the velocity of the erosional agent gradually slows down. For example- wind and water sort sediments whereas glaciers and gravity do not. • Types of sorting: • 1. Vertical sorting- sediments are sorted on top of one another as a landslide enters into water. • 2. Horizontal sorting- sediments will sort side by side as wind or running water slows down.

  4. 3-1-11Aim: How does a delta form? • Do Now: • 1. What is the difference between horizontal and vertical sorting? • 2. Which agents of erosion sort their sediments and why? • 3. What factors affect settling rate and how? • HW- Study Topics 9&10 for exam Thursday.

  5. Depositional Features1. Running Water- creates river deltas at the mouth of a river- a triangular shaped sorted deposit, or deposits on the inside curves of rivers. Can also create sand bars under the water which are called barrier islands if they are out of the water.

  6. 2. Wind- creates sand dunes on the beach or desert that are sorted with the gentle slope facing the wind.

  7. 3. Gravity creates piles of unsorted sediment at the base of a cliff or hill called Talus.

  8. 4. Glaciers create parallel grooves that can be finger lakes, morraines- piles of unsorted sediment running along the front or the side of the glacier, drumlins- little hills of unsorted sediment looking like sand dunes but the steep side faces where the glacier came from.

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