Across
- 6. What organ pumps blood through the body?
- 7. What gas do plants breathe in?
- 8. What is the hardest natural substance?
- 9. Which star gives Earth light and heat?
Down
- 1. What force pulls objects toward Earth?
- 2. What tool is used to see tiny objects?
- 3. What is water’s solid form called?
- 4. What part of the plant makes food?
- 5. What do humans breathe to stay alive?
- 6. What do we call animals that eat only plants?