Definitions for "Substrata"
Substrata is an ambient music album by Biosphere, released in 1997 by All Saints Records. It is considered to be a classic ambient album, consistently in the top 5 in surveys on the Hyperreal ambient mailing list
Keywords:  holdfast, alga, bound, material
The material that the alga's holdfast is bound to.
Keywords:  beneath, rock, soil, layer, surface
a layer of rock or soil beneath the surface