In this FACTivity, you will use every-day materials to explore how root size impacts the exchange of materials between roots and their surrounding environment. Materials: Electronic kitchen scale Clock or timer Sugar, finely ground coffee, cocoa powder, or similar item Measuring cup or tablespoon 1/2 inch twisted rope (hemp or cotton) Plastic cups with water Pencils Binder clips Sandwich bag Permanent marker Graphic organizer ( included ) Topics: Agriculture, Experiment, Graphic Organizer, Hands-on, Prairie, Roots, Soil.