Geological History of NYS

Front

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?

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Oxygen

Front

The geologic time line below represents the three most recent geologic eras. The numbers represent events in Earth's history. Which number best represents when humans are inferred to have first appeared on Earth?

Back

4

Front

The division of Earth's geologic history into units of time called eons, eras, periods, and epochs is based on

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fossil evidence

Front

During which geologic period could trilobite fossils have lived? Options: Neogene, Cretaceous, Triassic, Cambrian

Back

Cambrian

Front

When did the Jurassic Period end?

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144 million years ago

Front

What is the estimated age of Earth?

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4.6 × 10⁹ years

Front

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

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dinosaurs

Front

Studies of the rock record suggest that the period during which humans have existed is very brief compared to geologic time.

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the period during which humans have existed is very brief compared to geologic time

Front

The map below shows the distribution of ash across the United States as a result of the May 18, 1980 volcanic eruption of Mount St. Helens. Volcanic ash deposits such as these are usually excellent geologic time markers because they

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spread over a large area in a short amount of time

Front

Which index fossil has been found in Ordovician-age bedrock?

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