How do we affect the ecosystem, and what can we do to preserve it? Pupils explore chemicals that promote and inhibit plant growth, then discuss the importance of nitrogen and phosphorus to the survival of organisms and describe how...

Not all chemical reactions happen at the same rate because some, like explosions, occur quickly and some, like rusting, occur over time. Here, learners explore chemical reactions and their rates in the 16th lesson of 36. Through readings...

Learn all about where ground water is stored, how it moves, and how it is accessed in a detailed and thorough 10-page reading. Whether supplementing reading for an existing environmental or earth science course or providing background...

This website is quite unique, in that it compiles historical data in a segmented form of the birth and evolution of Black Christianity in America. Carter G. Woodson, one of the most respected names relative to the anthology of the Negro,...

Water is the source of life on earth. It exists in many forms and is constantly changing. The circulation and conservation of earth's water is called the hydrologic (or water) cycle. Find out how water evaporates, condensates,...

Explains why the Articles of Confederation were not strong enough to hold the country together. One result was a farmers' rebellion in Massachusetts led by Daniel Shays, which was precipitated by a debt crisis that caused many farmers to...

Explains what sedimentary rocks are, the three main types, and how they are formed.

Biographical details on Al Sharpton who began preaching at age four and became an ordained Pentecostal minister at age 10. A colorful and popular figure in the African American community, he embarked upon controversial protests that...