The delta is the result of sedimentation and erosion, the sediments varying in depth from at least 500m near the river mouths to only 30m at some places in the inner delta.
(The delta; is; the result of sedimentation and erosion) (the sediments; varying; from at least 500m near the river mouths)
The delta the sediments
is varying
the result of sedimentation and erosion
from at least 500m near the river mouths