Geologic Time

Edit Answers
123456789101112
Across
  1. 3. A scientist that studies the Earth and its history.
  2. 6. (TWO WORDS-NO SPACES)A process that determines the absolute age of rocks by measuring the decay of radioactive materials within them.
  3. 7. What "geos" means in English.
  4. 8. Epoch in which many modern species of small mammals appeared. Characterized by a warm climate and the separation of large continents.
  5. 10. (TWO WORDS-NO SPACES)The age of a rock in comparison to another rock.
  6. 11. An organized list that gives information in a form that is easy to read.
  7. 12. The study of the Earth and its history.
Down
  1. 1. (TWO WORDS-NO SPACES)the number of years ago a rock formed.
  2. 2. Period of time that saw the first dinosaurs.
  3. 3. (THREE WORDS-NO SPACES)A chronological record of the major events in Earth's natural history, with the oldest events at the bottom and newer events near the top.
  4. 4. Era of time that is composed of the Quaternary and Tertiary Periods.
  5. 5. (TWO WORDS-NO SPACES)The natural process by which unstable radioactive elements change to more stable elements.
  6. 9. Period of time characterized by the extinction of dinosaurs and the development of flowering plants.