subsurface

The karst depression belongs to the accumulative area of surface water and subdrainage area of subsurface water, the karstification is relatively week, and reservoirs are undeveloped.

The results show that the surface tension in the surface microlayer is lower than that of the subsurface water and the surface tension is associated with the DOC.

In light of the hazards and uncertainties associated with subsurface waste disposal, deep well injection may create pollutional problems.

Bright ejecta rays such as these are produced as impacts excavate and eject relatively unweathered subsurface material.