[Free Registration/Login may be required to access all resource tools.] Features of streams and rivers.

Students build a model ecosystem to simulate the life and limiting factors of the Terrapin turtle.

[Free Registration/Login may be required to access all resource tools.] Overview of aquatic organisms.

Windows to the Universe provides a general overview of the importance of the oceans and seas to the Earth. Content includes information on how the oceans impact Earth's weather and contribute to the water cycle.

Describes twelve kinds of ecosystems.

West Indian manatees are big, slow-moving, gentle vegetarians. They live in warm, shallow water in coastal rivers, estuaries, and lagoons. Learn more about the Trichechus manatus, more commonly known as a West Indian Manatee, in this...

Understand the basic characteristics of circulation in the Chesapeake Bay, by allowing students to change the wind speed and velocity, and the freshwater forcing through a number of subestuaries, and observe the resulting surface height,...

This site gives background information to ocean water and its contents. It has a link to an detailed chart showing the minerals and their content amount in ocean water. It also has links to activities.

A virtual clam dissection with high-resolution images of an intact clam, inner surface of valve, overview of clam with left valve removed, and overview of clam with left mantle removed, and more. (Click on the Microbial Life link.)

For good information about marine flora, go to this site from the Monterey Bay Aquarium Research Institute. It provides details about different types of seaweeds and phytoplankton. It also contains a photo gallery.

This lesson will illustrate the unique characteristics of oceans and oceanic life. It is 1 of 4 in the series titled "Oceans."

This lesson will illustrate the unique characteristics of oceans and oceanic life. It is 2 of 4 in the series titled "Oceans."

This lesson will illustrate the unique characteristics of oceans and oceanic life. It is 4 of 4 in the series titled "Oceans."

Explains why the Amazon River should be considered to be the widest river in the world, rather than the Rio de la Plata, also in South America.

A detailed travel map of southeastern England from 1908, showing portions of Kent County. The map shows first class and secondary roads, railways, cities, towns, ferry routes across the Strait of Dover with distance in miles, rivers,...

A detailed travel map of southeastern England from 1908, showing portions of East and West Suffolk, and Essex counties. The map shows first class and secondary roads, railways, cities, towns, coastal and terrain features of the area....

A detailed travel map of western England around the estuary of the rivers Mersey and Dee from 1908, showing portions of Lancashire, Flint, and Cheshire counties. The map shows first class and secondary roads, railways, cities, towns,...

A map of northeast Kent and the Thames Estuary at the time of the Saxon invasions, around AD 450. The map is color-coded to show the territories of the Britons in pink, the Saxons in orange, and the Angles in green. Although the Romans...

Vizcaya Bridge straddles the mouth of the Ibaizabal estuary, west of Bilbao. It was designed by the Basque architect Alberto de Palacio and completed in 1893. The 45-m-high bridge with its span of 160 m, merges 19th-century ironworking...