Measuring Time

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Across
  1. 5. a line marked off with a series of events and dates
  2. 6. based on movements of the Earth, moon, stars or a combination; people use them to measure the passage of time
  3. 7. the length of a timeline takes place
Down
  1. 1. a list of events in the order they occurred
  2. 2. a length of time singled out because of a specific event that happened during that time
  3. 3. people who study events in the past
  4. 4. one specific part in a timeline
  5. 8. the time before humans invented writing