Geological Time

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The longest interval of time is called _____.

An eon

The atmosphere was filled with poisonous gases during the:

Archean Eon

Which of the following events define the Proterozoic eon?

Eukaryotic cells first seen, stable continents, and oxygen builds up in the atmosphere

Why do some people argue that the Cenozoic era should not be called the "Age of Mammals"?

Flowering plants are just as common during this era, Insects are equally as abundant during this era, Birds are just as widespread as mammals during this era.

The solar system developed during the:

Hadean Eon

What do scientists use to divide the geologic time scale?

Major divisions in the fossil record

You wake up and find yourself surrounded by ferns, trees, flying birds, and different types of dinosaurs. Which era did you wake up in?

Mesozoic

The era that is defined by both a huge explosion in the diversity of life as well as the largest mass extinction is _____.

Paleozoic


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