1. Attendance2. Collect anything3. New Notes4. Worksheet

Friday, April 27

Rocks break when exposed to the air, water

and living things.

Softer rocks break first.

Limestone headstones weather relatively quickly.

Frost Action-water - freezes in cracks and expands.

Potholes get bigger because of frost action.

Roots can break rock apart.

Water makes rocks bump against each other and break.

Chemical Weathering – oxidation (rust)

Soil

Bedrock

Oops – bedrock – rocks under where we live

Hummus

Humus- part of soil made by dead and decaying organisms

Star-nosed mole.

Burrowing animals circulate air and nutrients in the soil.

Soil Profile

Matches the bedrock below.

Residual Soil – hasn’t been moved

NYS. Glaciers have transported most of the soils.

Transported Soils – have been moved.

Erosion – the transport of sediment

Sediment

Gravity – the driving force of downward movement of

sediments

Landslide – when gravity pulls sediment down without the aid of

water or wind.

http://www.youtube.com/watch?v=eR77MhKwAew

Mudslide

http://Mudslide in Southern Italy

Running Water moves the most sediment.

How fast do sediments travel?

Running water breaks down mountains and brings the

sediment elsewhere.

Straight streams flow faster.

More discharge = faster flow

Watershed - the area draining into a stream

Tributary – small stream that flows into a larger one.

Meander – curve in the river

Erosion and Deposition

Streams have V-shaped valleys.

Wind – horizontal movement of air.

Sandstorm in the Persian Gulf.

Wind can only carry small sediment.

Notice that the rock has been “sandblasted” along the ground. Wind carries sediment close to the ground.

Evidence of wind erosion.

Deserts have wind erosion.

The wind carries small pieces of broken rock (sand).

Shorelines are windy.

Sandblasting of rock

Sand Dunes are made by the wind dropping sand pieces.

Glacier – a moving mass of ice and snow.

Glaciers carry dirt and soil.

Striations – scratches in rock from the glaciers.

Glacial Till – mixed up, scratched rocks dumped as the glacier melted.

U-shaped valleys are from glaciers.

This hill was made by a glacier.

Waves

Waves come in parallel to the shore.