An EarthCache (sometimes abbriviated to EC) is a geocaching cache type. EarthCaches do not have physical caches.[1] Instead, to prove that the geocacher was at the location, EarthCaches require the geocacher finding it to answer questions based on an earth science lesson provided and through observations made at given coordinates. EarthCaches may have one site, or it could have multiple sites.[2] The geocacher sends their answers to the EarthCache owner, then logs their find online.[1][3][4][5] Created as a partnership between Groundspeak (the parent company of Geocaching) and the Geological Society of America (GSA),[6] EarthCaches are monitored by the GSA, and new EarthCaches must pass a review by a reviewer from the GSA (known as geoawares)[3][7] before being published.[3][4][7] As of 2024, there have been over 70,000 EarthCaches created.[8]

Origin

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A panoramic view of Wasp Head Rock from the EarthCache

At a 2003 GSA meeting, a discussion formed about how to get the general public interested in earth science. One of the members proposed the idea of collaborating with Groundspeak and incorporating earth science with geocaching. United States National Park managers didn't allow physical geocaches at the parks, but they were willing to allow EarthCaches because they didn't have containers and they taught earth science lessons. This allowed the EarthCache Program to be created, and in 2004, Gary Lewis—the GSA Director of Education and Outreach at the time (geocaching username geoaware)—hid the first EarthCache in New South Wales, Australia titled "Earthcache I - a simple geology tour of Wasp Head" (GCHFT2).[9] The EarthCache gives a lesson about erosion and the history of the rocks found in the area.[6][9][10]

Mastery Program

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References

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  1. 1 2 Cantor, Leah (2021-06-02). "Hunting for Treasure". Santa Fe Reporter. Retrieved 2026-05-27.
  2. Lewis, Gary B. (2010-12-01). "EarthCaching – An Earth science outreach success story". Episodes Journal of International Geoscience. 33 (4): 267–269. doi:10.18814/epiiugs/2010/v33i4/004.
  3. 1 2 3 Rhodes, Jennifer; Williams, Maggie; Plumb, Sue (2020). "The North West Geologist" (PDF). The North West Geologist (21): 25.
  4. 1 2 Zecha, Stefaine; Hilger, Ludwig (2015). "EarthCaches: An Opportunity for Learning Geoscience; a Pilot Study for Glaciomorphologically Themed EarthCaches" (PDF). Katholische Universität Eichstätt Ingolstadt: 325.
  5. Fisher, Dianna. "Geocaching: Perceptions of Impacts and Identity". ir.library.oregonstate.edu. p. 10. Retrieved 2026-05-27.
  6. 1 2 Rhodes, Jennifer; Williams, Maggie; Plumb, Sue (2020). "The North West Geologist" (PDF). The North West Geologist (21): 24.
  7. 1 2 "EarthCache Guidelines". The Geological Society of America. Retrieved 26 May 2026.{{cite web}}: CS1 maint: url-status (link)
  8. Keane, Christopher. "EarthCaches are Everywhere!". Earth Science Week. Retrieved 2026-05-27.
  9. 1 2 ARTVİNLİ, Prof. Dr. Eyüp; Başkanı, Kongre (2019). "Bildiriler Kitabi Proceedings" (PDF). International Congress of Geographical Education: 8.
  10. "Inside Geocaching HQ transcript (episode 65): EarthCache program with GSA's Matt Dawson – Official Blog". 2024-03-28. Retrieved 2026-05-27.