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Tree ring dating activity

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Here are a collection of great activities to choose from.

Even though they are not very abundant, these greenhouse gases have a major effect.The samples came from the following sources: All of these trees were growing in the same general area, so if they were alive at the same time, they should show the same ring patterns. Once you have found some pattern matches, line up the cores so that the patterns overlap.The practical applications of the study of tree rings are numerous.Their growth layers, appearing as rings in the cross section of the tree trunk, record evidence of floods, droughts, insect attacks, lightning strikes, and even earthquakes. Because the amount of water available to the tree varies from year to year, scientists can use tree-ring patterns to reconstruct regional patterns of drought and climatic change.This field of study, known as dendrochronology, was begun in the early 1900s by an American astronomer named Andrew Ellicott Douglass.The interactive diagram below demonstrates a very simple model of tree ring growth.

Select a temperature range (Normal, Cool, or Warm) and a precipitation amount (Normal, Dry, or Wet) for the coming year. The tree (which you are viewing a cross-section of the trunk of) grows one year's worth, adding a new ring.

The Summer 2010 issue of The Earth Scientist, available in our online store, includes articles on rivers and snow, classroom planetariums, satellites and oceanography, hands-on astronomy, and global warming.

Many educators are now finding opportunities to teach about Earth's climate and climate change in their classrooms.

Dendrochronology is an interdisciplinary science, and its theory and techniques can be applied to many applications. These research interests have in common the following objectives: Ring-counting does not ensure the accurate dating of each individual ring.

Numerous studies illustrate how ring-counting leads to incorrect conclusions drawn from inaccurate dating.

Windows to the Universe provides an interlinked learning ecosystem to a wealth of resources..Leaders from 192 nations of the world are trying to make an agreement about how to limit emissions of heat-trapping greenhouse gases, mitigate climate change, and adapt to changing environmental conditions...Climate in your place on the globe is called regional climate.