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Andrew Alden

Updated Articles and Resources

By Andrew Alden

    Updated Articles and Resources
    • What Is a Planet? Created: Tuesday, August 15, 2006 Updated: Wednesday, April 23, 2014
      Should geologists care what kind of planet Pluto is?" itemprop="description">
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    • Rocky Roadside Geology Created: Monday, January 11, 2010 Updated: Tuesday, April 22, 2014
      A candy wrapper shows how geologists differ from the rest of us.
    • About Plate Tectonics Created: Friday, December 31, 2010 Updated: Tuesday, April 22, 2014
      Start here to learn the basics of plate tectonics.
    • Rock Picture Index Created: Friday, January 06, 2012 Updated: Sunday, April 20, 2014
      My master alphabetical guide to igneous, sedimentary and metamorphic rock pictures.
    • Drilling into Faults Created: Saturday, May 14, 2005 Updated: Sunday, April 20, 2014
      Geologists are getting near the places where earthquakes actually happen." itemprop="description"> Sunday, April 20, 2014 Updated: Sunday, April 20, 2014
      An About.com Geology reader submits a hornfels specimen from Alaska.
    • Metamorphism or Metamorphosis? Which to Use Created: Saturday, April 19, 2014 Updated: Saturday, April 19, 2014
      Metamorphism is about rocks, while metamorphosis is about animals and other things.
    • About Geothermal Energy Created: Saturday, March 01, 2008 Updated: Thursday, April 17, 2014
      Geothermal energy exploits the Earth's heat budget.
    • The Tibetan Plateau Created: Friday, January 25, 2008 Updated: Thursday, April 17, 2014
      The largest highest place on Earth is a showcase of plate tectonics.
    • About Basalt Created: Tuesday, December 09, 2008 Updated: Thursday, April 17, 2014
      Basalt has a key role in Earth's tectonic cycle.
    • The Rare Earth Elements in Geology Created: Friday, December 10, 2010 Updated: Tuesday, April 15, 2014
      How the rare earths fit in today's geology." itemprop="description">
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    • Rock Identification Tables Created: Friday, November 25, 2011 Updated: Tuesday, April 15, 2014
      Identify 43 of the most common rock types: igneous, sedimentary and metamorphic." itemprop="description"> Friday, September 14, 2007 Updated: Tuesday, April 15, 2014
      Fossils are precious gifts from the geologic past: signs and remains of ancient living things preserved in the Earth's crust." itemprop="description">
    • How to Look at a Rock Created: Tuesday, March 31, 2009 Updated: Tuesday, April 15, 2014
      Notes on the most basic operation in geology.
    • Mineral Picture Index Created: Tuesday, January 03, 2012 Updated: Tuesday, April 15, 2014
      My master guide to annotated pictures to help you identify minerals: typical examples of rock-forming, accessory, and rare or notable minerals.
    • How We Date Ancient Planetary Surfaces Created: Friday, April 11, 2014 Updated: Friday, April 11, 2014
      How can we tell the age of features on other planets? It starts with counting impact craters.
    • Earthquake Resources for Western United States Created: Thursday, March 06, 2008 Updated: Tuesday, April 08, 2014
      Quake-related information--maps, reports, advice--for the United States west of the Rockies." itemprop="description"> Thursday, March 06, 2008 Updated: Tuesday, April 08, 2014
      Quake-related information--maps, reports, advice--for the Eastern United States." itemprop="description"> Tuesday, October 04, 2005 Updated: Monday, April 07, 2014
      The deadliest tsunamis recorded in each ocean basin.
    • Slag from Portugal Created: Monday, April 07, 2014 Updated: Monday, April 07, 2014
      An About.com Geology reader mistakes a slag specimen for an igneous rock.
    • The Permian-Triassic Extinction Created: Friday, November 11, 2005 Updated: Sunday, April 06, 2014
      New evidence and old converges on a volcanic explanation for "the great dying."" itemprop="description"> Sunday, April 06, 2014 Updated: Sunday, April 06, 2014
      Tufa forms as a carbonate crust around twigs and stems in a freshwater setting. Page 8.
    • Travertine Picture Gallery Created: Friday, January 29, 2010 Updated: Sunday, April 06, 2014
      A set of pictures exploring this rock type.
    • Calcite vs Aragonite Created: Saturday, April 05, 2014 Updated: Sunday, April 06, 2014
      Here's how these two closely related carbonate minerals matter in the Earth system.
    • Current Earthquakes Created: Friday, February 29, 2008 Updated: Wednesday, April 02, 2014
      Directions to information and data from earthquakes as fast as possible." itemprop="description"> Sunday, March 23, 2014 Updated: Sunday, March 23, 2014
      The San Andreas fault gets an up-to-date treatment by a geologist, for scientifically literate readers.
    • Marshall Beach, San Francisco Created: Thursday, July 17, 2008 Updated: Sunday, March 16, 2014
      Marshall Beach is a type specimen of the California coast.
    • Geology of the California Coast Created: Thursday, July 17, 2008 Updated: Sunday, March 16, 2014
      A survey of California's coastal geologic attractions, from north to south.
    • Geological Zombies Created: Sunday, March 09, 2014 Updated: Sunday, March 09, 2014
      Zombies make their ghastly presence known in geology.
    • Paleohurricane Science Created: Friday, September 02, 2005 Updated: Friday, March 07, 2014
      Geologists can find traces of past hurrricanes when they look in the right places.
    • Ballfield Dirt Created: Saturday, March 26, 2005 Updated: Friday, March 07, 2014
      Baseball is played on a precision geotechnical product.
    • Thermal Springs Created: Saturday, April 09, 2011 Updated: Sunday, March 02, 2014
      About the minority of springs that yield warm water.

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