AMHERST, Mass. - The ancient "Nasca lines" created on the desert floor by native peoples in Peru thousands of years ago may not just be works of art, according to a team of scientists from the University of Massachusetts. The team, which includes hydrogeologist Stephen B. Mabee and archeologist Donald Proulx, suggests that some of the mysterious lines may in fact mark underground sources of water. The research project is detailed in the December issue of Discover magazine. The team also includes independent scholar David Johnson, an adjunct research associate in the department of anthropology at UMass, and geosciences graduate students Jenna Levin and Gregory Smith.