earthcache

EarthCache is a type of geocache on Geocaching.com designed to educate participants about Earth's geology and natural processes. Unlike most caches, EarthCaches typically do not require a container to be found at the site; the primary objective is learning, not locating a hidden object. Visitors visit a real-world location with geological significance, observe features such as rock formations, sediment layers, fossils, erosion features, or hydrological processes, and report their observations online.

An EarthCache listing provides the site's geological context, learning goals, and tasks for visitors. After visiting the site, participants answer questions or provide data such as rock type, age indicators, stratigraphic relationships, measurement of features, and photographs. The log is submitted on the listing page, and many EarthCaches require reviewer verification to ensure the observations are accurate and educational. Seek to minimize environmental impact; no site disturbance or removal of natural materials is allowed.

EarthCaches are intended to be educational tools that connect geoscience with field experience. They are commonly used by schools, clubs, and individuals to promote science literacy, and they emphasize safety and respect for the environment and public land rules. The concept is administered by Geocaching.com contributors and reviewers, who ensure that listings meet guidelines for safety, legality, and educational value.