by |July 27, 2017

This core, from a small pond near the seashore, shows a sudden, visible shift. Coarse sand on the bottom indicates that the spot was once a wave-washed beach. Then the sea receded, and the beach became an inland pond, where only fine muck built up. The land here has been rising over much of the last 10,000 years, causing the relative sea-level drop.

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