History of Planet Earth

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Across
  1. 2. Era A major division of time in Earth’s history, containing multiple periods.
  2. 5. The disappearance of a species from Earth, often recorded in rock layers
  3. 6. the process by which rock and soil are worn away, which can affect rock layers
  4. 8. staying the same
  5. 10. the envelope of gases surrounding Earth
  6. 13. The study of rock layers and layering to interpret Earth’s history.
  7. 14. Layers of rock that are deposited over time, each layer representing a period in Earth’s history.
  8. 15. The process of sediments being laid down in layers, forming strata.
  9. 16. Movement of Earth’s plates that can tilt, fold, or disrupt rock strata.
  10. 17. The numerical age of a rock or fossil, often determined using radiometric dating.
Down
  1. 1. A subdivision of an era on the geologic time scale, marked by significant events in Earth’s history.
  2. 2. A system of chronological measurement that relates rock layers (strata) to time, used to describe the timing and relationships of events in Earth’s history
  3. 3. one of the things that leaves a volcano in an eruption
  4. 4. the age of a rock layer compared to other layers
  5. 7. Fossils of organisms that lived during a specific time period, used to help date rock layers.
  6. 9. Rock formed by the deposition and cementation of mineral and organic particles over time, often containing fossils.
  7. 11. preserved remains, impressions, or traces of ancient organisms found in rock layers.
  8. 12. changing