Investigating rocks as part of our #geology unit. @Stevenmenz @mmmusdcesu https://t.co/5iiXbgXwTg

Investigating rocks as part of our #geology unit. @Stevenmenz @mmmusdcesu https://t.co/5iiXbgXwTg (via Twitter http://twitter.com/StevenMenz/status/910158166956150787)