This document discusses Greek and Latin root words related to water, circles, and centers. It provides examples of words containing roots like "hydr-" meaning water, "aqua" meaning water, "mar/mer" related to the sea, "cycle" meaning circle, "circ/circum" meaning around, and "centr/center" meaning middle. Examples given include hydrate, dehydrate, hydrant, aquarium, aquatic, aqueduct, aquifer, marina, maritime, marine, cycle, cyclical, cyclone, circumference, circuit, circumstance, circumvent, central, concentric, and eccentric.