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Imagine yourself in Central Park one million years ago. You would be standing on a vast ice sheet, a 4,000-mile glacial wall, as much as 2,000 feet thick. Alone on the vast glacier, you would not sense its slow crushing, scraping, ripping movement as it advanced south, leaving great masses of rock debris in its wake. Under the frozen depths, where the carousel now stands, you would notice the effect on the bedrock as the glacier dragged itself along.1

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