Chapter 10Using natural resources. STUDY. Flashcards. Learn. Write. Spell. Test. PLAY. Match. Gravity. Created by. stlleroy. Science 4th grade Ethan . Terms in this set (62) Humus. The decomposing material that is a rich dark brown color. Solar Cells. Inside y our solarpowered device is a solar cell that changes energy from the sun into electrical energy. Ore. a rock rich in material that ...