Volkswagen-sized boulder sourced from the upper part of the photo that landed in a small channel along road PR-335R in Barrio Barina of Yauco. Note multiple headscarps above, and the track of the boulder on the channel bank. Credit: Stephen Hughes

Volkswagen-sized boulder sourced from the upper part of the photo that landed in a small channel along road PR-335R in Barrio Barina of Yauco. Note multiple headscarps above, and the track of the boulder on the channel bank. Credit: Stephen Hughes

Volkswagen-sized boulder sourced from the upper part of the photo that landed in a small channel along road PR-335R in Barrio Barina of Yauco. Note multiple headscarps above, and the track of the boulder on the channel bank. Credit: Stephen Hughes

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Alka Tripathy-Lang, PhD

Alka Tripathy-Lang is a freelance science writer based in Chandler, Arizona, and holds a Ph.D. in geoscience.
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