Earth Science: The Geologic Time Scale

Question 1

Second era of the phanerozoic eon. Known as the era of reptiles.

Accepted Answer

Mesozoic era

Question 2

First period of the Cenozoic Era. Flowering plants conquered the land.

Accepted Answer

Paleogene

Question 3

Last period of the Paleozoic Era. The largest of all mass extinctions happened.

Accepted Answer

Permian

Question 4

The first three eons of Earth's history are collectively referred to as the...

Accepted Answer

Precambrian time

Question 5

Largest unit of geologic time.

Accepted Answer

eon

Question 6

How old is planet Earth?

Accepted Answer

4.6 billion years

Question 7

Smallest unit of geologic time.

Accepted Answer

epoch

Question 8

First period of the Mesozoic Era. Pangaea begins to break apart.

Accepted Answer

Triassic

Question 9

Last period of the Cenozoic Era. Primates evolve.

Accepted Answer

Quaternary

Question 10

Last period of the Mesozoic Era. The K-T extinction occurred.

Accepted Answer

Cretaceous

Question 11

First period of the Paleozoic Era. There was an explosion of life in the oceans.

Accepted Answer

Cambrian

Question 12

Third era of the phanerozoic eon. Known as the era of mammals.

Accepted Answer

Cenozoic era

Question 13

Second period of the Cenozoic Era. Ice age happens.

Accepted Answer

Neogene

Question 14

Second period of the Mesozoic Era. Dinosaurs evolved.

Accepted Answer

Jurassic

Question 15

First era of the phanerozoic eon. Known as the era of arthropods.

Accepted Answer

Paleozoic era

Questions 15