Andrew Alden Geology Expert Education B.A., Earth Sciences, University of New Hampshire Introduction Professional geologist, writer, photographer, and geological tour guideThirty-seven years of experience writing about geological subjectsSix years as a research guide with U.S. Geological Survey (USGS)Member of Geological Society of America (GSA), and American Geophysical Union (AGU) Experience Andrew Alden is a former writer for ThoughtCo who contributed hundreds of articles for more than 17 years. Andrew works as a geologist, writer, editor, and photographer. He has written on geological subjects since 1981 and participates actively in his field. For example, Andrew spent six years as a research guide with the U.S. Geological Survey, leading excursions on both land land and at sea. And since 1992, he has hosted the earthquakes conference for the online discussion platform, The Well, which began as a dialogue between the writers and readers of the Whole Earth Review. In addition, Andrew is a longtime member of the member of the Geological Society of America — an international society that serves members in academia, government, and industry; and the American Geophysical Union — a community of earth and space scientists that advances the power of science to ensure a sustainable future.Andrew lives in Oakland, California; and though he writes about the whole planet and beyond, Andrew finds his own city full of interest too and blogs about its geology. Education Andrew Alden holds a bachelor's (B.A.) degree in Earth Science from the University of New Hampshire, College of Engineering and Physical Sciences, in Durham, N.H.Awards and PublicationsAndrew Alden on Earthquakes (The Well Group, Inc., 2011)Assessment of River — Floodplain Aquifer Interactions (Environmental and Engineering Geoscience, 1997)Andrew Alden on Hosting (The Well Group, Inc., 1995) ThoughtCo and Dotdash Meredith ThoughtCo, a Dotdash Meredith brand, is an award-winning reference site offering education content created by experts. ThoughtCo reaches 13 million readers each month. Learn more about us and our editorial guidelines. Read more from Andrew Alden How to Travel Like a Geologist Geologic Time Scale: Eons and Eras Geologic Time Scale: Eons, Eras, and Periods Rock Identification Made Easy A History of Stone Tools, Then and Now Geology, Earth Science and Geoscience: What's the Difference? Minerals of the Earth's Surface Map of Tectonic Plates and Their Boundaries Where Things Come From: Rock Materials A Visit to Sharktooth Hill Everything You Need to Know About Coal Densities of Common Rocks and Minerals Orogeny: How Mountains Form Through Plate Tectonics A Fossil Picture Gallery What Are Dikes and How Do They Form? Map of Natural Radioactivity in the United States What Is Subduction? What Happens at Transform Boundaries? Divergent Plate Boundaries Reverse, Strike-Slip, Oblique, and Normal Faults Meteorites from Other Planets Evaporite Minerals and Halides How to Look at a Rock Like a Geologist Carbonate Minerals