Mercury is a barren planet with little atmosphere. In many regards it is similar to our own moon. However, it is also very close to the Sun, so humans will have to set up bases in craters or near the Poles to avoid being blinded.
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.
so Ur answer is Deltas are build up by deposition
Your answer would be C hope this helps friend ^^
This would be the topsoil or A horizon
made up of organic matter like dead plant and animal matter
<span>:P hope this helps
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