Across
- 2. It helps scientists determine the age of trees.
- 7. A greenhouse gas produced by cars.
- 8. Remains or impressions of plants and animals.
- 10. The first living things on Earth that exploded in this era.
Down
- 1. Certain farming practices, such as deforestation for crops, use of synthetic fertilizers, and overgrazing contribute to climate change.
- 3. It’s a calendar that helps us understand the history timeline.
- 4. A supercontinent that existed 250 millions years ago.
- 5. plants produce oxygen during this chemical change.
- 6. A species of animals that got extinct due to a meteorite.
- 9. A way scientists can figure out how old something is by measuring a special atom called carbon-14.