Ice-age sea-level declines can expose land bridges between continents that were previously submerged.
Sources
- Ice Age - Definition & Timeline (history.com)
- https://www.nps.gov/articles/aps-v12-i2-c8.htm (nps.gov)
- https://research.princeton.edu/news/bering-land-bridge-formed-surprisingly-late-during-last-ice-age (research.princeton.edu)
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