Weathering and Erosion This unit explains how the processes of the ...
Weathering and Erosion
May 26, 2016
Weathering and Erosion
This unit explains how the processes of the earth break down and reform the landscapes
Weathering and Erosion
May 26, 2016
Weathering - the break down of rocks into sediments Mechanical (Physical) - the breakdown of rock that changes the size and shape only Chemical - the breakdown of rock that changes the chemical make up of a rock ie: iron + oxygen = rust
Weathering and Erosion
Erosion - the transport or moving of broken down sediment. The major force behind erosion is gravity Deposition - the laying down of sediments
May 26, 2016
Weathering and Erosion
May 26, 2016
Wind Erosion - the movement of sediment by wind. This will sandblast rocks and form dunes Occurs mostly in arid (dry) climates
Weathering and Erosion
May 26, 2016
Mass Wasting - the movement of sediments through gravity only
Mass Wasting is seen as landslides and avalanches
Weathering and Erosion
May 26, 2016
Erosion by Running Water Rivers cut V shaped valleys
Weathering and Erosion
May 26, 2016
Rivers Carrying Sediments Minerals dissolve in solution Silt and clay remain in suspension Sand and pebbles bounce (saltation) Cobbles and boulders roll on the floor
Weathering and Erosion
May 26, 2016
Weathering and Erosion
May 26, 2016
Erosion by Running Waters The steeper the gradient, the faster the water flows Straight channels - young, fast rivers Meandering channels - older, slower rivers
Weathering and Erosion
May 26, 2016
In a Meandering River The outside of the bend is fastest so erosion occurs here
The inside of the bend is slower so deposition occurs here
Weathering and Erosion
May 26, 2016
Glaciers Glaciers are giant blocks of moving ice Most of Long Island and New York State were created by glaciers Glaciers usually form in cold regions and high elevations
Weathering and Erosion
May 26, 2016
Glaciers Glacier begin to retreat (melt) when temperatures increase Glaciers move by gravity
Weathering and Erosion
May 26, 2016
Evidence Left By Glaciers Striations - long grooves left in rocks as glaciers pass over them Chatter Marks - grooves left by boulders at the bottom of glaciers U-Shaped Valleys
Weathering and Erosion
May 26, 2016
Evidence Left By Glaciers Glacial Till- unsorted sediments left behind as glaciers retreat Moraines - mounds of glacial till left when glaciers retreat Drumlins - tear shaped hills. The pointy end shows the direction of movement
Weathering and Erosion
May 26, 2016
Evidence Left By Glaciers Kettle Lakes - buried ice blocks melt and leave behind round lakes Finger Lakes - long narrow lakes gouged out by advancing glaciers
Weathering and Erosion
May 26, 2016
Evidence Left By Glaciers Glacial Erratics - large boulders that have a different bedrock structure than the one they are found in
Weathering and Erosion
May 26, 2016
Deposition in Quiet Water
River Deltas - caused by deposition when flowing water suddenly slows down (river flows into ocean)
Weathering and Erosion
May 26, 2016
Horizontal Sorting As moving water slows down, it drops the sediments out of the stream
Weathering and Erosion
May 26, 2016
Sediments sort vertically in water by:
1. Size: Bigger = Faster 2. Shape: Round = Faster 3. Density: Dense = Faster
lead
wood
Weathering and Erosion
May 26, 2016
Erosion By Waves
Longshore drift - the movement of sediments parallel to the shore (zigzag movement)
Wave Erosion sorts sediments
May 26, 2016
Weathering and Erosion
This unit explains how the processes of the earth break down and reform the landscapes
Weathering and Erosion
May 26, 2016
Weathering - the break down of rocks into sediments Mechanical (Physical) - the breakdown of rock that changes the size and shape only Chemical - the breakdown of rock that changes the chemical make up of a rock ie: iron + oxygen = rust
Weathering and Erosion
Erosion - the transport or moving of broken down sediment. The major force behind erosion is gravity Deposition - the laying down of sediments
May 26, 2016
Weathering and Erosion
May 26, 2016
Wind Erosion - the movement of sediment by wind. This will sandblast rocks and form dunes Occurs mostly in arid (dry) climates
Weathering and Erosion
May 26, 2016
Mass Wasting - the movement of sediments through gravity only
Mass Wasting is seen as landslides and avalanches
Weathering and Erosion
May 26, 2016
Erosion by Running Water Rivers cut V shaped valleys
Weathering and Erosion
May 26, 2016
Rivers Carrying Sediments Minerals dissolve in solution Silt and clay remain in suspension Sand and pebbles bounce (saltation) Cobbles and boulders roll on the floor
Weathering and Erosion
May 26, 2016
Weathering and Erosion
May 26, 2016
Erosion by Running Waters The steeper the gradient, the faster the water flows Straight channels - young, fast rivers Meandering channels - older, slower rivers
Weathering and Erosion
May 26, 2016
In a Meandering River The outside of the bend is fastest so erosion occurs here
The inside of the bend is slower so deposition occurs here
Weathering and Erosion
May 26, 2016
Glaciers Glaciers are giant blocks of moving ice Most of Long Island and New York State were created by glaciers Glaciers usually form in cold regions and high elevations
Weathering and Erosion
May 26, 2016
Glaciers Glacier begin to retreat (melt) when temperatures increase Glaciers move by gravity
Weathering and Erosion
May 26, 2016
Evidence Left By Glaciers Striations - long grooves left in rocks as glaciers pass over them Chatter Marks - grooves left by boulders at the bottom of glaciers U-Shaped Valleys
Weathering and Erosion
May 26, 2016
Evidence Left By Glaciers Glacial Till- unsorted sediments left behind as glaciers retreat Moraines - mounds of glacial till left when glaciers retreat Drumlins - tear shaped hills. The pointy end shows the direction of movement
Weathering and Erosion
May 26, 2016
Evidence Left By Glaciers Kettle Lakes - buried ice blocks melt and leave behind round lakes Finger Lakes - long narrow lakes gouged out by advancing glaciers
Weathering and Erosion
May 26, 2016
Evidence Left By Glaciers Glacial Erratics - large boulders that have a different bedrock structure than the one they are found in
Weathering and Erosion
May 26, 2016
Deposition in Quiet Water
River Deltas - caused by deposition when flowing water suddenly slows down (river flows into ocean)
Weathering and Erosion
May 26, 2016
Horizontal Sorting As moving water slows down, it drops the sediments out of the stream
Weathering and Erosion
May 26, 2016
Sediments sort vertically in water by:
1. Size: Bigger = Faster 2. Shape: Round = Faster 3. Density: Dense = Faster
lead
wood
Weathering and Erosion
May 26, 2016
Erosion By Waves
Longshore drift - the movement of sediments parallel to the shore (zigzag movement)
Wave Erosion sorts sediments
