https://www.earthmagazine.org/tags/columbia/ Recent content in Columbia on EARTH Magazine Hugo en-US American Geosciences Institute. All rights reserved. Tue, 16 Aug 2016 13:51:12 -0400 https://www.earthmagazine.org/article/earthworms-build-big-mounds-escape-floodwaters/ Tue, 16 Aug 2016 13:51:12 -0400 https://www.earthmagazine.org/article/earthworms-build-big-mounds-escape-floodwaters/ <figure class="earth-figure"> <img src="https://www.americangeosciences.org/static/earth/earthworms-build-big-mounds-escape-floodwaters/Surales.jpg" alt="Large mounds, called surales, dot the landscape in the Orinoco Llanos region of South America. Credit: Delphine Renard." loading="eager" decoding="async"> <figcaption>Large mounds, called surales, dot the landscape in the Orinoco Llanos region of South America. Credit: Delphine Renard.</figcaption> </figure> <p>When researchers looking for archaeological remains in satellite imagery came across unidentified mounds — some as tall as humans — in the seasonally flooded wetlands of northern South America, they found a landscape shaped not by ancient civilizations but, rather, by modern earthworms.</p>