A most critical problem continues to be the control of the ever increasing quantities of harmful pollutant runoff from farms, cities, industry, construction sites and mines that contaminate the underground aquifers and other water sources.
(A most critical problem; continues; ) (A most critical problem; to be; the control of the ever increasing quantities of harmful pollutant runoff from farms, cities, industry, construction sites and mines) (construction sites and mines; contaminate; the underground aquifers and other water sources)
A most critical problem A most critical problem construction sites and mines
continues to be contaminate
the control of the ever increasing quantities of harmful pollutant runoff from farms, cities, industry, construction sites and mines
the underground aquifers and other water sources