Density and Buoyancy word search, scramble and crossword puzzle

I made this density and buoyancy puzzle set for my Year 4 students during our physical science unit. The kids could see a rock sink and a cork float but had no idea why. So I put together a word search, a word scramble, and a crossword using words like density, buoyancy, float, sink, mass, volume, water, oil, displacement, dense, less dense, object, liquid, and compare. Nothing fancy — just puzzles to help the vocabulary finally make sense.

The set is six pages: three puzzles plus answer pages. The word search works well for quiet time after break. The scramble gets them talking because they argue about why a heavy ship can float but a small rock sinks. The crossword I use for partners. I added a couple simple drawings of objects floating and sinking in water but nothing too busy.

Works for Year 4 through 6. Print and go. Sometimes I have early finishers explain why ice floats on water on the back. The kids actually ask for these now.