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What sorts of social and cultural changes,and what new social groups and institutions,allowed the spread of Enlightenment ideas?
Varves
Thin, alternating light-colored and dark layers of sediment that form in lakes because of seasonal variations of deposition and biologic activity.
Ice Cores
Cylinder-shaped samples from ice sheets or glaciers that scientists study to understand past climates.
Tree Rings
The concentric rings on the cross-section of a tree trunk, representing a record of a tree's age and the conditions under which it grew.
Paleozoic
An era in the geologic time scale, approximately 541 to 252 million years ago, marked by the early development of life, including the Cambrian explosion.
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