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a dune looks like a mound, hill, or ridge of sand.
barchan dunes open away from the wind while parabolic dunes open facing the wind
That would be sand dunes
it is basically a side of the dune known as the slipface
A stream is water runing along the ground through a trench in a down hill direction. A spring is water coming from under the ground to the surface.
A hill of sand in a desert is normally referred to as a dune
small hill of sand caused by the action of wind
a dune looks like a mound, hill, or ridge of sand.
Dune.
A windswept hill of sand.
That would be sand dunes
barchan dunes open away from the wind while parabolic dunes open facing the wind
A valcano has, or has had lava in it, a hill does not
sand dune
Sand-dune.
A dune
It is called a "Sand Dune".