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Weathering, Erosion, and Deposition.

Exploring the effects, causes, and meaning of weathering, erosion, and deposition.
by

Myrna Medina

on 9 January 2013

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Transcript of Weathering, Erosion, and Deposition.

How can humans prevent the negative effects of weathering, erosion, and deposition on the surface of the Earth? Deposition is the placement or accumulation of rock, particles of rock, or organic matter, known as sediments. These deposition sediments are carried by wind, water, ice, or gravity and transported to different areas. What is erosion, weathering, and deposition? What are the effects of weathering, erosion, and deposition? Deposition Beaches are probably the most familiar depositional land form. Waves push piles of sediments against the land forming sandy beaches.
This arch is formed by erosion of solid rock by water. The eroded material is then carried down stream. The effects of weathering can be seen by the smooth rocks found along rivers. As the rocks are moved along the river banks they bump into each. After a while these rocks become smooth and small. Mechanical weathering is the break down of rocks without any change in the chemical nature of the rocks. The rocks are essentially torn apart by physical force.
Frost wedging is when water freezes and thaws in the cracks of rocks causing them to break apart.
Temperature can also weakening rocks structure as they are cooled and heated. Biological weathering is the physical or chemical breakdown of rock caused by living organisms, such as plants, animals, bacteria, and fungi.
Most often the cause of biological weathering are plant roots. These roots can extend downward, deep into rock cracks in search of water, and nutrients.
In the process they act as a wedge, widening and extending the cracks.
Other causes of biotic weathering are:
digging animals
microscopic plants and animals
algae
fungi. Mechanical Weathering Weathering is the process of weakening and breaking of rocks. It is the physical and chemical breakdown of rocks and minerals at or near the Earth's surface.
The three types of weathering are:
mechanical
chemical
biological Weathering Erosion is the transporting of the land sediments by water, ice or wind.
Glacial erosion: Material can be washing away of sediments through the action of ice.
Fluvial erosion: land sediments can be washed away by water in rivers.
Wind: can also blow sediment particles away that are loosen by weathering processes first. Biological Weathering Chemical Weathering Erosion Deposition Chemical weathering causes reactions that loosen the bonds holding rocks together causing them to fall apart forming smaller and smaller pieces.

The most common types of chemical weathering are oxidation, hydrolysis and carbonation.
Oxidation takes place when oxygen combines with other elements in rocks to form new types of rock. These new substances are usually much softer and easier to break apart.
Hydrolysis occurs when water combines with the substances in rocks to form new types of substances that are softer than the original rock types. This allows other forces, such as mechanical weathering, to more easily break them apart.
Carbonation takes place when carbon dioxide reacts with certain types of rocks forming a solution that can easily be carried away by water. Erosion Weathering Wetlands are created by the erosion of mountains to form wetlands. How does weathering and erosion affect where humans decide to build businesses and homes? Weathering and erosion can be dangerous to humans. Some of these types of dangers are landslides, runoffs, and volcanoes.

There are some areas are more likely to have landslides than others. A area that has hills or mountains that has frequent rain or snow would not be a good place to build a home because the treat of landslides. Build homes and businesses at the bottoms canyons, valleys, gullies, stream channels, culverts would also not be a good idea because of the dangers of runoff. Don't build there! Reforestation is a way humans can prevent the negative effects of erosion. Foresters can plant trees in land that has been harvested as soon as possible to prevent land erosion. Erosion Humans can prevent the weathering of the environment by reducing the burning of coal, oil, and gasoline.
When humans burn these materials, harmful gases like carbon dioxide, nitrogen, and sulfur are released into the atmosphere.
These harmful gases react with rainwater to form much stronger carbonic, nitric, and sulfuric acids that damage the environment. Weathering Deposition Estuaries, deltas, salt marshes, coastal sand dunes and sand and gravel shorelines all require regular, natural deposition of various sediments to retain their habitat characteristics.

Fine sediment such as sand and silt provides the primary material in which plants root and certain animals burrow.

Human-made structures such as seawalls and groynes prevent sediment transportation, and starve nearby shores of fine sediment.

Humans can help prevent the starvation of shoreline animals by limiting the amount of seawalls and groynes along these shorelines.
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