Assertion: main aquifer | /r/HasProperty | horizontal layers of materials
Facets:
value: mostly
type: DEGREE
Source sentences:
text: In mountainous areas (or near rivers in mountainous areas), the main aquifers are typically unconsolidated alluvium, composed of mostly horizontal layers of materials deposited by water processes (rivers and streams), which in cross-section (looking at a two-dimensional slice of the aquifer) appear to be layers of alternating coarse and fine materials.