You need to make a small raft that can float across a river. You have very limited materials so you must choose carefully. Your options are wood, metal, stone, and plastic.
Use the information in the table above to help guide your decision.
Which material would you use for your raft? Why?
A) Metal because it has the highest density
B) Plastic because it is the lightest material
C) Stone because it is the strongest material
D) Wood because it has the lowest density
