- Which of the following materials absorb water? Write A on the blank for material that absorbs water and N if the material will not absorb water. 1. marble 2. face towel 3. cotton 4. sponge _5. stone Classify the materials according to their ability to float or sink. Write F on the blank for material that float nd S if the material sinks. 6. metal spoon 7. toy boat (paper) 8. large stone 9. plastic cup 10. styrofoam​