Across
- 2. a stable and common mineral that can survive erosion
- 6. small fragments of orbiting bodies that have fallen onto Earth
- 8. Eras are divided into what?
- 11. sedimentary rocks that area rusty red color
- 13. building blocks of proteins
- 15. rocks that form when magma goes into an exiting rock
- 16. mammals dominate land
- 18. found in Minnesota, Wisconsin, Canada, Michigan and Greenland
- 21. small fragments of granite-rich crust that continued to form as volcanic activity continued
- 23. they show the impressions of large, soft bodied eukaryotes
- 24. traces if tiny, thread like organisms
- 25. Era Emergence of dinosaurs
Down
- 1. exposed rocks of the craton in deep places
- 3. the process by which a planet becomes internally zoned
- 4. cardon or mineral-rich objects
- 5. large, coral-reef like mounds of cyanobacteria in the early Proterozoic
- 7. a ancient continent of North America and is one of the largest Proterozoic land masses
- 9. the oldest and most stable part of a continent
- 10. organisms whos cells contain RNA and DNA in the nuclei
- 12. formations locally high concentrations of iron oxides
- 14. sedimentary rock on top of eroded sedimentary rock
- 17. Eons are made up of what?
- 19. Periods are divided into what?
- 20. organisms that do not contain nuclei
- 22. sedimentary rock over igneous or metamorphic rock