Freshwater lake area as an ecological SYSTEM. Location: Lake Mead in Nevada. Author(s): Karl Spencer.
Alligator as an integral part of the ecological SYSTEM. Location: Brazos Bend State Park. Author(s): Karl Spencer.
Freshwater runoff creating erosion, illustrating CAUSE-EFFECT. Location: Monterey Bay. Author: Karl Spencer.
A view of Johns Hopkins Glacier from afar. Vocabulary Connections – Glacier, Precipitation, Evaporation, Saltwater and Fjord. Location: Glacier Bay National Park in Alaska. Author: Karl Spencer.