A tropical lagoon is bordered by land on at least one side and is blocked from the sea by different types of barriers. ... Shelf lagoons may have, at one time, been one of the other types of lagoons. ... The existence of barriers on at least one side of a lagoon is an essential feature. ... Warm marine waters and a lack of rivers supplying alluvial material to the marine environment favor carbonate deposition. ... After the lime mud and other sediments are deposited they are then bioturbated by small burrowing marine animals. ...

• Word Count: 1364
• Approx Pages: 5
• Has Bibliography
• Grade Level: Undergraduate

Of the total world's freshwater supply, about one third is found underground, and when many rivers have been dammed, creating very dry land, the water cycle is disrupted causing the ground to become increasingly dry. ... "If human beings dam the rivers, or pollute the water supply, dumping wastes into rivers and lakes and groundwater reservoirs, then the natural environment suffers," says Gordon Young, a geographer at Wilfrid Laurier University in Waterloo, Ontario who created a report released Wednesday March 2003 in Tokyo. "If we allow poverty related to water to exist in other count...

• Word Count: 1147
• Approx Pages: 5
• Has Bibliography
• Grade Level: Undergraduate

As a complete whole, our global community is affected by the choices made by others, others who we may not know or ever see. Choices made in other countries can and will affect the countries you reside in. Overall economy in our world is as essential as any other topic at hand. ... Drastic shortages of food and water heighten the gap between rich and poor and often lead to conflicts on all sides. ... River systems and aquifers have been seriously depleted by water withdrawals. ...

• Word Count: 780
• Approx Pages: 3
• Grade Level: Undergraduate