Noor's crossword

4. the middle part of the earth
5. periods of thousands, millions, and billions, of years referred other scientists who study the earths history
6. a large natural elevation of the earth's surface
8. a boundaries between tectonic plates that are moving towards each other
9. volcano built up of ash or lava
10. a volcano that has not erupted for at least 10,000 years, but scientists think it may erupt again
11. a volcano that is erupting
16. a theory that the contents were attached together in the past, and have been falling apart ever since
17. a scientist who uses fossil evidence to study life in prehistoric times
19. a single landmass

1. an area where one tectonic plate is forced downward
2. a boundary between tectonic plates that are moving away from each other
3. outer part of the earth
7. the plates sliding sideways past each other
12. the size of a diagram or model in proportion to the actual size of a object
13. part of the earth between the core and the the crust
14. the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection in thought to occur
15. a sudden shaking of the ground
16. outer layer of the Earth
18. no longer in existence