Which of these are more dense in water? foam ball wood block oil rock

Rock is the most dense of the options listed.<br /><br />* **Foam ball:** Filled with air, making it less dense than water. It floats.<br />* **Wood block:** Many types of wood are less dense than water and float. Some denser woods may sink.<br />* **Oil:** Less dense than water. It floats on top.<br />* **Rock:** Almost always denser than water. It sinks.<br />