Mr. Nieves participated of the �Teacher in Residence Program� a summer internship at the Arecibo Observatory for qualified high school science teachers. A large fraction of Mr. Nieves effort was devoted to his role as an instructor in the Geoscience Workshop (June 5-17).� Mr. Nieves provided a series of hands-on activities and lectures related to the geology of Puerto Rico to a group of 24 participants.� He also organized a field trip to the karst region in which participants collected rocks and fossils.� He also provided training in the use of the GPS and map and compass. As part of his duties, Mr. Nieves assembled a collection of Puerto Rican rocks and fossils (properly classified) that will be part of a new exhibit at the Visitor Center depicting the Geology of Puerto Rico.