13. Rosa dropped pencil, plastic cup, rubber ball and metal spoon in a basin of water at the same time. Which material sank in the basin? a. metal spoon C. rubber ball b. plastic cup d. pencil 14. Which of the following statements is true about porous materials? a. They have small holes that do not allow air or liquid to pass through. b. They do not have holes that allow air or liquid to pass through. c. They have small holes that allow air or liquid to pass through d. They do not have small holes that do not allow air or liquid to pass through 15. An object's shape can affect its ability to float, but some materials float no matter what their shape is. Which is an example of this? a. one-peso coin b. styrofoam C. stone d. metal spoon​