Answer: In some parts of the world, windblown dust and silt blanket the land. This layer of fine, mineral-rich material is called loess. Loess is mostly created by wind, but can also be formed by glaciers. When glaciers grind rocks to a fine powder, loess can form.
The answer would be in a spiral arm. The spiral arms are then region of the stars being extended from the spiral's center and the barred spiral galaxies. The region which is a long and thin one looks like a spiral and so the name spiral galaxy is given.
