The nonprofit investigative news unit California Watch is distributing “Ready to Rumble,” a coloring and activity book to help kids prepare for an earthquake. It’s part of “On Shaky Ground,” a 19-month investigation into the seismic safety at K-12 public schools in the state that reveals the Division of the State Architect approved at least 20,000 school buildings that lacked the final safety certification required by law. Underwriters for the coloring book, available in English, Spanish, traditional Chinese, simplified Chinese and Vietnamese, include KQED public radio and Public Insight Network. California Watch partners include the PBS NewsHour.