An extensive biography of William Morris Davis (1850-1934 CE), often called "The father of American geography." He was one of the founders of the Association of American Geographers and a regular contributor to the National Geographic...

Earth's magnetic poles have reversed themselves throughout its long history. Find out what scientists know about these reversals. A geologic time line shows when the reversals occurred.

Lesson plan in which students place events in sequence, comparing their life to the history of the Earth.