[Free Registration/Login may be required to access all resource tools.] How scientists can determine age and other features of a rock or material it contains.

[Free Registration/Login may be required to access all resource tools.] How scientists can determine age and other features of a rock or other material.

Have you ever looked at a tree and wondered just how long it had been standing there? The branches and the trunks of trees have unique rings inside them, which can be seen if you cut a transverse section of a tree. These rings appear as...

Examine how scientists determine the age of living and non-living trees and identify factors that impact sizes of tree rings. Analyze tree ring samples and determine the age of the oldest sample.

"The quest for a reliable method to find your way at sea was one of the thorniest problems of the 1700s." Find out about the search for longitude at this NOVA site. Includes interactive Shockwave game, learning activities and more.

Thorough introduction to Hegel's life and system, organized by headings. Includes German words for key concepts. Final section of twelve offers a critical appraisal of Hegelianism from Catholic perspective. Please note that ?The Catholic...

Historical overview of Louis XIV and XV reigns in France as a comparison between an absolute monarch and an enlightened monarch. Details the varying styles of two monarchs-one oppressive to the human spirit and a counter-cultural...

Find out how scientists can find out the age of the rocks they are studying.

In this amazing interactive tutorial you will learn about what methods are used by geologists to learn about the history of the Earth. Investigate a geologic time scale and learn about how scientists have developed and organized a record...

A map of the United States and territories in 1821 after the Missouri Compromise, showing the Free States and territories, the Slave States and territories, and the transitional territories at the time. The map is color-coded to show the...