Ground Up: Teacher Answer Key 1. How does radon move up through rock and soil? Students should find that radon can move through porous or permeable rocks, spaces between rocks and gravel, and cracks in rocks and soil. Sandstone tends to be permeable, and uranium is generally found in sandstone deposits. 2. Examine the rock and soil samples that are representative of the local geology. Which rock and soil types might slow or block radon's movement? Students should find that radon may be blocked by less permeable rock and soil types like clay, slate and granite. Radon that is trapped in the soil will decay to form lead. 3. How might ground water or the moisture content of soil affect radon's movement? Students should conclude that ground water or moist soils slows down radon movement. A rn* United States RadTown Radon Activity Set EPA402-B-19-052 Environmental Protection #* Agency https://www.EPA.gov/RadTown/Activity-l-Ground ------- |