Assertion: e horizon | /r/HasProperty | low
Facets:
value: in humus
type: LOCATION
value: in fe and al oxides
type: OTHER
Source sentences:
text: The E horizon (or Ae in Canadian soil classification system), which is usually 4 to 8 centimetres (1.57 to 3.15 in) thick, is low in Fe and Al oxides and humus.