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Most muckrakers believed that their primary function in the progressive attack on social ills was to
Mesozoic Era
A geologic era that occurred about 252 to 66 million years ago, characterized by the dominance of dinosaurs and the appearance of flowering plants.
Mass Extinctions
Events in Earth's history when significant numbers of species disappear rapidly and irreversibly, often due to drastic environmental changes.
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.
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