Weathering and Erosion

By: Natalie Wendorf



Rocks wear away over time.

Mechanical/Physical Weathering

Certain Kinds of weathering happen in certain places. Physical weathering causes rocks breaking up in pieces.

Examples of Mechanical/Physical Weathing

Freeze and Thaw: Water expands when it freezes. Cracks form when the water freezes and water goes into the cracks when thawed. This process is repeated until the rocks break.

Weathering by Temperature changes: The rock expands in high temperatures and contracts in low temperatures. The outer layers fall apart because of cracks in the rock.

Weathering by Water, Wind, and Waves: Rocks that have jagged or rough edges become smooth. The runoff water carries small particles and gets on the large rocks, so the rocks break down or wear away.

Chemical Weathing

Chemicals reacting on rocks. Calcium carbonate reacts with rain water and is in limestone. Calcium carbonate makes soluble substances. Carbon dioxide in the atmosphere makes the rain dissolve. The rain reacts to the rocks which makes rocks weather.

Examples of Chemical Weathering

Oxidation: The rocks breakdown from oxygen and water. The rusty colored rocks on the surface are from the iron-rich rocks.

Limestone: Contains calcium carbonate or calcite. This chemical makes the rock fizz when water gets on limestone. So the rain water makes a limestone rock fizz.

Biological Weathering

All living things cause biological weathering.

Examples of Biological Weathering

Trees: The cracks get farther apart as the plant grows in the rock. The trees grow in rocks because they are finding moisture. The roots grow inside the rock and cause the rock to widen apart.

Bacteria: Bacteria, algae, and lichens produce nutrients on the rock and this causes the rock to break down. They produce nutrients because they can survive on these nutrients they need.



Sediment gets moved from one place to the other by wind, water, ice, or gravity. The wind takes small particles. Water takes large particles.

Erosion by Wind

The wind carries small particles from one location to another. Sometimes the wind against rocks makes the rocks wear away. If this process continues there won't be any particles left.

Small sediment size can be carried because wind can only pick up small particles. The wind carries small particles and makes the particles wear away. They go from one place to another.

Examples of Erosion by Wind

Gobi Desert: The wind created sand walls or sand dunes.

Arches National Park: The arches were created by the wind carrying sand.

Big image
This picture is an example of Erosion By Wind because it shows the sand blew and became packed together to create a hill.

Erosion by Water

The rock sediments get washed away by the rain. This type of erosion may change the shape of coastlines. Pebbles change to sand when the waves crash against the shore. This process may also erode cliff near the seaside.

Any size sediment can be carried because slow moving water carries little particles. Fast moving water carries large particles.

Examples of Erosion by Water

Grand Canyon: The Colorado River cut into the earth to create the Grand Canyon.

Cape Hatteras Lighthouse: The beach got eroded by the ocean and the water got closer to the lighthouse.

Video of Erosion By Water

This video is an example of Erosion By Water because it shows that flowing water can carry particles from one place to another.

Erosion by Gravity

Gravity takes rocks downhill because of weathering processes. The rain or snow goes into rocks, pressure in the rock increases. Then this causes cliffs and hills to be able to fall due to gravity.

Any size sediment can be carried by hills falling from rocks with pressure. Cliffs can also be carried.

Examples of Erosion by Gravity

Hills and Cliffs: because gravity has a powerful force.

Houses: because during natural disasters when water takes away houses.

Big image
This picture is an example of Erosion By Gravity because it shows that gravity brought the tree trunk down.

Erosion by Ice/Glaciers

As the glacier moves it picks up sediment that's any size. The sediment carried on the glacier scrapes against the ground. Then the ground and rocks become eroded. The glaciers take away soil and rocks. They may also take out valleys and basins.

Any size of sediment because the glacier picks up any sediment and it goes over the ground. The sediment makes the ground erode and soil gets scraped away.

Examples of Erosion by Ice/Glaciers

Northern North America and Europe: The glaciers created these continents because of erosion.

Greenland and Antarctica: The glaciers pick up sediment and moves toward the sea, downhill.

Works Cited



-geology society

-national geographic

-discovery education