Earthquake Topics — Trenching

Earthquake Science Explained — A series of short articles for students, teachers, and parents originally published as weekly features in The San Francisco Chronicle. This USGS General Information Product presents some of the new understanding gained and scientific advances made in the century since the Great 1906 San Francisco Earthquake. (USGS)
Who Dunit? and the Law of Superposition (PDF) — solve a crime, and then use those same skills to understand the Law of Superposition (older layers of the earth on bottom) with a fun WhoDunit? investigation and then use your skills to solve a geological mystery (USGS)