The University of Rhode Island's Office of Marine Programs website offers interested parties a primer on the science of sound in the sea. The main topics covered here are "Sound", "Sound Movement", "Sound Measurement", "Sounds in the Sea", and "Advanced Topics". Visitors who are unfamiliar with the basics of sound should start out with "Sound" to learn about such subtopics as "How do you characterize sounds?" and "How are sounds made?" "Intensity", "Frequency", and "Wavelength" are also explained in "Sound". Visitors should note that within the subtopics, the words or phrases that are highlighted in green can be clicked on to read the definition. A menu on the left side of any page of a subtopic lists all the main topics, and scrolling over a main topic reveals all the subtopics available to peruse. Visitors shouldn't miss the "Sounds in the Sea" topic to learn about such concepts as "People and Animal Use", "Sonar", "Echolocation", and "Underwater Sounds".