A delta.
delta is
sediment
ofcourse no
A triangular-shaped feature of deposits at the mouths of many rivers is called a delta. It usually is in the shape of what is called an alluvial fan.
Dunes are formed from aeolian deposition which consists of the wind picking up sediment, then blowing it, then dropping it. Dunes are an accumulation of sediment. More sediment is deposited on a dune as wind loses more energy when it hits it, thus depositing the sediment, growing the dune.
delta is
it is a delta at least in science class.
delta
silt This trianguar deposit of sediment where a river empties into an ocean is called a delta.
sediment
A pyramid is triangular shaped.
continental rise
continental rise
continental rise
the deposition or accumulation of sediment
An alluvial plain, sometimes also referred to as a fluvial plain.
a triangular pyramid has six edges and four triangular shaped faces