American Geosciences Institute
American Geosciences Institute: Earth Science Week: Logs of Straw Dendrocronology
Using straws to recreate tree rings, students learn how dendrochronologists work. Construct a 50-year climatic history on a three-meter time line.
University of California
Ucmp: Sequencing Time
Lesson plan in which students place events in sequence, comparing their life to the history of the Earth.
PBS
Nova: Magnetic Storms: When Compasses Pointed South
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.