Other
Discovery of Sound in the Sea
Discover how animals use sound to communicate. Provides links to the uses of sound, effects of sound as well as sound production and reception.
Curated OER
Educational Technology Clearinghouse: Maps Etc: North America, 1916
A map from 1916 of North America, Central America, Greenland, and the Caribbean to Puerto Rico showing land elevations, water depths, and isothermal lines of mean temperatures for January and July. The map uses color-contouring to show...