Across
- 3. Release of gasses from volcanoes forming the atmosphere.
- 6. This layer of the Earth is made from iron and magnesium.
- 8. Evaporation and precipitation caused this material to accumulate in the oceans.
- 10. Comprises oceans, rivers, lakes and swamps.
- 11. This blew the original hydrogen into outer space.
- 12. This plus helium comprise the early atmosphere.
- 15. Caused the layering of the earth's interior.
- 16. The core of the Earth is made from this and iron.
- 17. Small bodies that join to form planets.
Down
- 1. Earliest organisms that released oxygen into the atmosphere.
- 2. Major molecule missing from the earth's early atmosphere.
- 4. Material crust is made from.
- 5. Includes soil, minerals, and rock formations.
- 7. Includes Carbon dioxide, air and clouds.
- 9. The early oceans were filled with this type of water.
- 13. Includes all living things.
- 14. This size rock hit the Early earth forming debris that became the moon