geological time scale

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Across
  1. 5. the smallest unit of time, often used in physics and computing
  2. 6. A unit of time equal to one twenty-forth of day a day
  3. 7. A span of time characterized by particular events situationor developments
Down
  1. 1. a unit of time equal to 60 seconds
  2. 2. the division of time based on the lunar cycle approximently 29.5 days
  3. 3. the period of time it takes for the earth to complete one orbit around the sun
  4. 4. the measurment of time based on the position of the sun in sky
  5. 7. a large division of geological time often characterized by significant changes in climate and life forms.