Devise a plan to keep the ground frozen, create a thawing program, and design a structure that can move with ground subsidence. Display the plans and structure. It drilled 12,000 holes to test for permafrost. Drill a vertical hole to create a core, using tools like copper tubing, plastic tubing, or gardening tools for digging bulbs. Call a local soil-testing firm for literature to share with your class.
Ice wedges form in the permafrost tunnel when water seeps into a crack in the frozen ground.
The water freezes and ice expands, pushing out in all directions. The wedge partially melts during its formation, allowing more water to fill the void and expand the size of the wedge upon refreezing. Make a small crack and line it with plastic so it will hold water. Place water in the lined crack. Freeze the box.