The desert is dry. Dust flys even at the merest breeze. On the other hand well watered soil sticks together. The Genesis story says that we were made from dust. There is no picture of a well watered garden sprouting forth with humans. There is a sense of play when the wind blows the dust. It is dynamic and the dust can take varied shapes as opposed to rich soil which will fall unmaginatively back to the ground.
We are woven says the Psalmist. (Ps 139) By placing the Psalm next to the Genesis 2 passage I would like to say we are woven from dust.