Geologic Time

1. a slowly moving mass of ice formed by the accumulation and compaction of snow over hundreds to thousands of years
6. several hundred million years. (900,000,000-65,000,000 years long)
7. Common fossils that only appear in a narrow range of rock layers
9. The chronological arrangement of artifacts or events compared to one another.
11. a division of geologic time, lasting millions to hundreds of thousands of years. (9,000,000-100,000 years long)
12. the largest division of geologic time, lasting
13. a period of long-term reduction in the temperature of Earth's surface and atmosphere

2. says that in undisturbed layers of rocks, the youngest layer is on top and the oldest layer is on the bottom, each layer being older than the one above and younger than the one below.
3. a division of geologic time that could last as long
4. The estimate age of an object using methods like radio metric dating
5. a division of geologic time, lasting from hundreds of million years to millions of years. (250,000,000-1.8 million years long)
8. to several hundreds of millions of years. (500,000,000 years long or more)
10. A mixture of tiny particles of clay to huge boulders that a glacier picks up as it moves.
14. times of warmer global average temperature lasting thousands of years that separate glacial periods within an ice age