The correct answer is (b). The Environmental Education, Science and Technology Building opened in April 1999, during the celebration of Earth Week. It houses the Elm Fork Education Center, which includes an Outdoor Environmental Learning Area. The waterfall can be found within this 7,000-square-foot aquatic, geological, archaeological and paleontological classroom designed for hands-on exploration by students of all ages. Students can explore the intricate aspects of water as it begins its journey at the waterfall, continues through the river and empties into the pond. Students also can identify native Texas plants and animals in their natural habitats. For more information and more photos of the aquatic area, visit www.efec.unt.edu/odela.htm.