A presentation of the Eons of the Precambrian and the Eras of the Phanerozoic Eon. Includes lots of visuals and slides which summarize important events of the past and hypotheses about the formation of the moon, mass extinctions, and endosymbiosis. Would be a good summary after a unit on geologic time, or could also be used over several days with supplemental activities.
And - Just for fun, here's a photo I took from my microscope of a stained cross-section of a pine needle.
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