A petrified forest is generally interesting for students because fossilized materials were around when dinosaurs were around. There are lots of great information in the video about how the petrified wood was created and how these fossils can tell us a lot about the history of the area. An activity that models the process of petrified wood would be a great pair with this video, for students to experiment with materials entering the wood, such as the activity at this link: http://utw10107.utweb.utexas.edu/education/resources/pdf/wood4-8.pdf