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Across 5. When heating changes a liquid into gas called vapour. 6. A type of well. 7. An area of fresh water usually made when people build a wall across a river. 9. The power that makes things work. 10. Water that contains salt which are not good for most plants and animals. 11. Useful things that people need and use in their lives. 12. Layers of sand that trap tiny pieces of solid material.

Down 1. A building that contains pumps that push water through water pipes. 2. Tiny life forms that can get into our bodies and make us sick. 3. Waste that comes from toilets and drains. 4. Water that people and animals can drink. 8. A place where clean water is stored.