Across
- 2. What's the word for when things decay and break down into simpler parts?
- 6. Plants need this gas to carry out photosynthesis, and humans exhale it when they breathe out. What is it?
- 7. What substance do cars, planes, and stoves need to burn in order to produce energy?
- 8. What term describes a change in matter that results in the formation of new substances with different properties?
- 9. What do you see when something is burning?
- 10. What happens to iron when it's exposed to water and air for a long time?
- 11. What process do plants use to make their own food using sunlight, water, and carbon dioxide?
Down
- 1. When rain or snow falls from the sky, it's an example of this process. What's the word for it?
- 3. What gas do we breathe in to keep our bodies functioning?
- 4. What's the term for when a substance combines with oxygen?
- 5. What remains after something has been burned, like in a fire or after a cigarette is finished?
- 6. What do you call the process of something burning or catching fire?
- 7. When you see flames and feel heat, what phenomenon is occurring?
- 12. What do you feel when you stand close to a fire or hold your hand over a stove?