Rate of Change and Tree Rings BC Calculus. Image by Lonnie Thompson Observations?

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Presentation transcript:

Rate of Change and Tree Rings BC Calculus

Image by Lonnie Thompson Observations?

Rates of Change are not all the same

Start Exploration 1 In your group complete all parts of the exploration. Trees help us to understand – Ecology, Climatology – Geology, anthropology What is Dendrochronology? The real science beyond just counting the rings. The real science beyond just counting the rings.

For More Tree Information knowledge/annual-growth-rings/ knowledge/annual-growth-rings/ The Forest Academy

1. Narrow rings do not only signify a lack of sun or water. A forest fire may have damaged the tree's crown and slowed its growth. Defoliation by insects or fungi can have the same effect. After several years, the tree gained strength and returned to normal growth.

2. This tree had a rough time during its first ten years! Maybe someone helped it by cutting the large trees around it to give it more light.

3. Trees don't all have their heart in the right place! This tree shows off-centre growth. If the tree was in a location exposed to high winds, its wood would grow faster (wider rings) on the side away from the wind than on the side facing the wind.

4. This cross section may also come from a tree that was leaning. The tree formed reaction wood (compression wood) that enabled it to straighten up. The wider rings are on the underside of the leaning trunk because growth was faster there.

From NOAA Nice teacher’s source. imate/teachingclimate/trees_recorders_of_ti me.pdf imate/teachingclimate/trees_recorders_of_ti me.pdf cher.html cher.html

Oldest Trees Methuselah Others