This document discusses how geocaching can be used as a cross-curricular activity in K-12 education. It explains that geocaching involves using GPS devices to find hidden containers called geocaches. It then provides examples of how geocaching can integrate subjects like social studies, math, science, reading, and more. Lessons described include creating geocaches on campus with academic clues, using coordinates to solve math problems, and gathering data on ecosystems. The document encourages educators to brainstorm their own geocaching lesson ideas to engage students across multiple subjects.