A horizon This is the second layer down and its main constituents are mineral soils and organic matter that have been partly decomposed.
(mineral soils and organic matter; have been partly decomposed; ) (its main constituents; are; mineral soils and organic matter that have been partly decomposed) Context(its main constituents are,List([44, 69))):(This; is; the second layer down)
its main constituents are,List([44, 69))
mineral soils and organic matter its main constituents This
have been partly decomposed are is
mineral soils and organic matter that have been partly decomposed
the second layer down