Dynamic Earth

3. Bang - The colossal explosive event that marked the origin of our universe.
4. - The thin rocky outer skin of the Earth that we live on.
8. - A well-substantiated, extensively tested explanation for a phenomenon.
9. plates - Massive rigid slabs of the lithosphere that move.
13. - All living organisms on Earth and the environments they inhabit.
14. - An interactive complex whole made of naturally joined parts.
15. - The ultra dense metallic inner center of the Earth.
16. - The solid rocky body of the Earth from surface to center.
17. - Preserved remnants or traces of ancient life trapped within rock layers.
18. - All of Earths water including oceans rivers and ice.

1. Time Scale - The calendar of Earths 4.6 billion year history.
2. - The thick middle layer of Earth composed of dense silicate rock.
5. - The foundational doctrine that states the present is the key to the past.
6. - A tentative, testable explanation for a natural phenomenon.
7. - The blanket of gases surrounding the planet.
10. - The brittle rigid outer layer encompassing the crust and uppermost mantle.
11. planets - The rocky dense inner worlds of our solar system.
12. - The hot weak plastic like layer of the upper mantle that flows.