Earth’s Echoes, Women’s Power: Two Stories of Sound and Strength

The Spark · Feb 4, 2026 · 44m

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We begin with Dr. Brett McLaurin, Professor of Environmental, Geographical, and Geological Sciences at Commonwealth University, who helps us understand why certain rocks can sing. Using the famous ringing rocks of Bucks County as a starting point, Dr. McLaurin explains how mineral composition, cooling rates, and internal stress create boulders that chime like bells when struck. From Pennsylvania to sites around the world, these “lithophonic” rocks reveal surprising truths about Earth’s processes — and why some landscapes literally hold their own music.

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Then we shift from…