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Deposition learn earth science

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The document discusses various factors that influence rates of deposition including: particle size and density, with larger and denser particles settling fastest; slope, with lower slopes having higher deposition rates; stream velocity, with slower velocities resulting in more deposition; and stream discharge, with higher discharge carrying more sediment farther. Deposition is greatest inside curves of rivers and at river mouths where velocity is lowest. Particle size decreases in deposited sediments as velocity decreases due to larger particles settling out first. Deltas form at river mouths. Wind deposits sediments in piles called dunes that are oriented with the prevailing wind direction. Glacial deposits like till are unsorted while features like erratics and striations are left by glaciers.

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Deposition Hydrology NOTES page 11 ©Mark Place, 2009-2010 www.LearnEarthScience.com
big objects take the least amount of time to settle
denser particles settle first
Rate of Settling Particle Shape
Rate of Deposition Slope
Rate of Deposition Stream Velocity
Rate of Deposition Stream Discharge
Deposition in Rivers
Where is deposition greatest? Inside of Curve Mouth of River
Why? lowest velocity
What agent of deposition? glacier
Deposition by Streams: Graded Bedding fast slow fast slow
 
What happens to particle size? Why?
What happens to particle size? decreases, because the velocity decreases
What is this? delta
large small
What agent? wind
What direction?
Glacial Deposits till unsorted
Glacial Deposits erratics
Glacial Deposits striations
Glacial Features
Regents Review This sand dune was most likely formed by 1. water flowing from the left 2. water flowing from the right 3. wind blowing from the left 4. wind blowing from the right 3
X X X C B A Deposition Equilibrium Erosion
Which graph best represents the relationship between the discharge of a stream and the velocity of stream flow? 1. 2. 3. 4. 1
As the velocity of a stream transporting pebbles, sand, silt, and clay decreases from 30 cm/s to 0.1 cm/sec, some sediment deposition will occur. Which choice below best describes the sediments that will be deposited as a result of the decrease in stream velocity? 1. pebbles, sand and some silt 2. clay and some silt 3. pebble, sand, silt, and most of the clay 4. only some sand and clay 1
Which agent of erosion most likely produced this valley’s shape? 1. wave action 2. moving ice 3. blowing wind 4. flowing water 2
Transported sediments are usually deposited at locations in which 1. the freeing and thawing of water occurs 2. the chemical breakdown of rocks occurs 3. a decrease in the speed of the agent of erosion occurs 4. an increase in the physical weathering of rocks occurs 3
In a soil sample, the particles have the same shape but different sizes.  Which graph below best represents the relationship between particle size and settling time when these particles are deposited in a quiet body of water? 1. 2. 3. 4. 4
Which statement best describes sediments deposited by glaciers and rivers? 1. Glacial deposits and river deposits are both sorted. 2. Glacial deposits are sorted, and river deposits are unsorted. 3. Glacial deposits are unsorted, and river deposits are sorted. 4. Glacial deposits and river deposits are both unsorted. 3

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Deposition learn earth science