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1. Transporting logs

· Logs are transported from the forest through rivers to the sawmill

· Logs float because less denser than water

2. Hot air balloon

· It rises in the air when the hot air in the balloon isless dense than the surrounding air

· It falls when the cooled air in the balloon is denserthan the surrounding air

3. A submarine

· It can be made denser or less dense than the surrounding water by pumping water in and out of it

· Hence, it can float or sink in water

4. A raft

· A raft is made of bamboo or logs

· A rat floats because bamboo or logs are less dense than water

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