One of the most confusing parts of this cycle is when the water becomes classified as groundwater.
(One of the most confusing parts of this cycle; is; when the water becomes classified as groundwater) (the water; becomes; classified as groundwater) (the water; classified; as groundwater)
One of the most confusing parts of this cycle the water the water
is becomes classified
when the water becomes classified as groundwater
classified as groundwater
as groundwater