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Moore's research focuses chiefly on a process known as tidal pumping. Groundwater typically seeps into tiny pores in layers of rock. At high tide, salt water also seeps into the rock layers, mixing with the fresh groundwater, and at low tide, the salt/freshwater mixture gets pulled into the ocean. Then more fresh groundwater is allowed to seep into the rock, and the tidal pumping cycle begins again.

focuses = concentrates                            seeps = leaks
chiefly = mainly                                       tiny = small
typically = usually                                    pores = holes

The process that Willard Moore is studying closely is called tidal __________

a. mixing                  b. pumping                  c. seeping               d. cycling