work of river as an agent of erosion and deposition. Draw its well labelled diagram.
Answers
A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another.[1] Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often be described by a chemical equation. Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reactions of unstable and radioactive elements where both electronic and nuclear changes can occur.
Answer:
Erosion and deposition are responsible for many landforms. Erosion is the transport of sediments. Agents of erosion include flowing water, waves, wind, ice, or gravity. Eroded material is eventually dropped somewhere else. This is called deposition.
How Flowing Water Causes Erosion and Deposition
Flowing water is a very important agent of erosion. Flowing water can erode rocks and soil. Water dissolves minerals from rocks and carries the ions. This process happens really slowly. But over millions of years, flowing water dissolves massive amounts of rock.
Moving water also picks up and carries particles of soil and rock. The ability to erode is affected by the velocity, or speed, of the water. The size of the eroded particles depends on the velocity of the water. Eventually, the water deposits the materials. As water slows, larger particles are deposited. As the water slows even more, smaller particles are deposited
Flowing water erodes or deposits particles depending on how fast the water is moving and how big the particles are.
Water Speed and Erosion
Faster-moving water has more energy. Therefore, it can carry larger particles. It can carry more particles. What causes water to move faster? The slope of the land over which the water flows is one factor. The steeper the slope, the faster the water flows. Another factor is the amount of water that's in the stream. Streams with a lot of water flow faster than streams that are nearly dry.
Particle Size and Erosion
The size of particles determines how they are carried by flowing water. This is illustrated in Figure below and at the link below:
Minerals that dissolve in water form salts. The salts are carried in solution. They are mixed thoroughly with the water.
Small particles, such as clay and silt, are carried in suspension. They are mixed throughout the water. These particles are not dissolved in the water.
Somewhat bigger particles, such as sand, are moved by saltation. The particles move in little jumps near the stream bottom. They are nudged along by water and other particles.
The biggest particles, including gravel and pebbles, are moved by traction. In this process, the particles roll or drag along the bottom of the water.
How Flowing Water Moves Particles. How particles are moved by flowing water depends on their size.
Deposition by Water
Flowing water slows down when it reaches flatter land or flows into a body of still water. What do you think happens then? The water starts dropping the particles it was carrying. As the water slows, it drops the largest particles first. The smallest particles settle out last.
Erosion and Deposition by Surface Water
Water that flows over Earth’s surface includes runoff, streams, and rivers. All these types of flowing water can cause erosion and deposition.
Erosion by Runoff
When a lot of rain falls in a short period of time, much of the water is unable to soak into the ground. Instead, it runs over the land. Gravity causes the water to flow from higher to lower ground. As the runoff flows, it may pick up loose material on the surface, such as bits of soil and sand.
Runoff is likely to cause more erosion if the land is bare. Plants help hold the soil in place. The runoff water in Figure below is brown because it eroded soil from a bare, sloping field.
Erosion by Runoff. Runoff has eroded small channels through this bare field.
Much of the material eroded by runoff is carried into bodies of water, such as streams, rivers, ponds, lakes, or oceans. Runoff is an important cause of erosion. That’s because it occurs over so much of Earth’s surface.
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