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Scale of Geologic Time Multiple Choice Test

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Scale of Geologic Time

Use your knowledge of Earth science to answer all questions in the data set. You will need your Earth Science reference tables and a calculator to answer some of the questions. Good Luck.

NOTE: If the question contains an image, clicking on it will enlarge it for easier viewing. If there is a "More Info" link after the question, clicking it will display additional content related to the question.

Approximately 2.2 billion years ago, which gas was first added in large amounts to Earth’s atmosphere from life-forms that evolved in the oceans?

Antarctica's location and climate changed over the last 200 million years because Antarctica moved

Which series of events took the least amount of time to complete?

Which life-forms were living on Earth when India was at position A?

Which graph shows the relative duration of geologic time for the Precambrian, Paleozoic, Mesozoic, and Cenozoic time intervals?

What is the estimated age of Earth?

Trilobite fossils were recently discovered in Himalayan Mountain bedrock. During which geologic period could these organisms have lived?

What percentage of Earth's history represents human existence?

Which number best represents when humans are inferred to have first appeared on Earth?

Geologists have subdivided geologic time into units based on

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