| Activity | Topic | Grade Level |
Source | Time | Special Materials |
| Meeting in the Middle: How good are your directions in building a tunnel? | Tunnels | 5-6, 7-8 | Building Big | 30 min. | n/a |
| Tunnel Through! Build a model mountain tunnel that simulates the principles behind real-life engineering design. | Tunnels | 5-6, 7-8 | Teach Engineering | 1 1/2 hours | Per group: 25 lbs. of clay (buy online) |
*Indicates whether an activity is suitable for a community event. Activities considered appropriate for a large-scale community event are attention-grabbing but simple; use inexpensive materials; require minimal instruction, supervision, and cleanup; and can be modified to take place over a short period of time (about 15-20 minutes).
