1 at the top
At the mouths of rivers.
because they needed water for everything
Erosion
Deltas are areas of rich soil located at the mouths of many rivers. As rivers move downstream, they pick up soil from the river banks, later depositing it at the delta.
Most rivers flow into the sea, so the mouths of them are located near the sea.
Parana river and urguay river
science
Sediment can accumulate at the mouths of rivers, usually in the form of deltas.
Freshwater and saltwater meet at the mouths of rivers that flow into the sea.
Delta - a delta is a landform that forms at the mouth of a river, where sediment carried by the river is deposited and accumulates in a triangular or fan-shaped pattern. Deltas are typically rich in nutrients and support diverse ecosystems.
The ocean, obviously, just below the surface at the mouths of rivers and streams.
Falmouth is a town based at the mouth of the river fal.