Why does this rock look like a sponge

This week, Mystery Doug explores the question: "Why does this rock look like a sponge?" Don't forget to vote for next week's question here: https://mysterydoug.com/vote Mystery Doug answers a real kid's question every week in a 5-minute video for your students that is the perfect break for your morning meeting, snack times, and any transition times in your day. Sign up for free on our website at https://mysterydoug.com/?s=social:youtube to receive our newest video each week.