Decomposition processes alter plant residue materials until it becomes soil humus which contains ______ carbon.
(Decomposition processes; alter; plant residue materials; T:until it becomes soil humus) (it; becomes; soil humus which contains ______ carbon) (soil humus; contains; ______ carbon)
Decomposition processes it soil humus
alter becomes contains
plant residue materials T:until it becomes soil humus
soil humus which contains ______ carbon
______ carbon