What do scientists believe caused the extinction of the dinosaurs?

Which vertebrate did not live during the time of the dinosaurs?

What is the best evidence that many different geologic periods are represented in Virginia?

Compared to the Rocky Mountains, the Appalachian Moutains are much

Which of these is the best evidence that the Earth's crust has undergone some major changes?

Of the following, the largest divison of the geologic time scale is

Which of these is the best evidence that the Earth's crust has undergone some major changes?

Of the following, the smallest division on the geologic time scale is

What era do we live in?

How old do scientists believe the Earth is?

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