Across
- 4. the innermost layer of the Earth
- 6. an educated guess
- 8. the solid, rocky part of the Earth
- 10. a set of principles or interacting components
- 11. the study of the relationships between living things and their environment
Down
- 1. the molten rock layer of the Earth
- 2. the portion of the Earth that is water
- 3. a mixture of gases that surrounds the Earth
- 5. the part of the Earth where life exists
- 7. a step by step process to carry out an experiment
- 9. the outermost layer of the Earth