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Verbal·Craft and Structure·Words in Context

easy

Water flowing through a river’s hyporheic zone—i.e., the subsurface region where surface water mixes with groundwater—flows not only beneath but also        the channel. Indeed, by mapping aquatic organisms found in soil beyond a waterway’s banks, scientists have shown the extent of the hyporheic zone’s reach, which for a great river like the Congo can stretch up to 400 meters from the channel.

A

clockwise around

B

deep under

C

adjacent to

D

contrary to