Question

Write about formation of delta.

Answer 1

Answer:

When a river reaches a lake or the sea the water slows down and loses the power to carry sediment . The sediment is dropped at the mouth of the river. Some rivers drop so much sediment that waves and tides can't carry it all away. It builds up in layers forming a delta.

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Answer 2

Answer:

hey mate here is the answer to your question...

Explanation:

• Deltas are formed at the end of rivers (river mouth) as it flows into the sea

• Rivers carry a lot of sediment (mud)

• The river flows into a calm sea

• This slows the river down

Which makes the river drop its sediment

• This deposited sediment builds up over years creating a delta

• The river is forced to split up

• The smaller rivers made by deltas are called distributaries

• Examples of Deltas are Nile Delta, Ganges Delta

• The formation of a delta must start with the flow of a river. Every river on the surface of the earth flows from its source to its mouth under the natural force of gravity. As the river enters the sea or ocean, and the current is no longer restricted to the channel, it opens out, loses momentum and ultimately stops. The reduction in velocity of the current makes the river incapable of transporting sediment farther.

• Deposition of sediment occurs at this time. While deposition of sediment takes place, a series of small channels known as distributary channels develop, instigating a gradual build out of the shoreline. The landform created is known as a delta. When the rivers transporting the sediment are smaller, and their currents weaker, the forward movement of the river may stop instantly upon reaching the sea or ocean.

• This mainly occurs when the river drains into an area filled with strong wave activity. If a river drains in an area with strong waves, no delta will develop. Larger rivers, on the other hand, always possess some current for several distances to the final destination, resulting in the creation of a massive delta.

• As the flowing river reaches its final destination (lakes, ocean or sea), deposition of sediment takes place according to size of the grain. The first to be deposited is sand, which is the coarsest sediment. Since sand is the coarsest, it’s deposited close to the mouth of the river. The finer sediment (silt, fine sand, and clay) is deposited next. The outcome is a unique series of layers called topsets, foresets, and bottomsets.

• As the name suggests, the topsets are the topmost layers. They consist of the coarsest sediment making up the section of the delta above sea level.

• The foresets encompass fine sand, which eventually culminates to silt and clay accumulated in layers slanting towards the sea or ocean.

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