L7. THE GEOLOGIC TIME SCALE

Question 1

It is a record of fossils and geologic events of the earth made from the study of earth’s layer of rocks using relative and absolute dating.

Answer 1

Geologic Time Scale

Question 2

It is a unit in geologic time that includes two or more periods.

Answer 2

Era

Question 3

It is a unit of geologic time that is longer than epoch but shorter than an era.

Answer 3

Period

Question 4

It is the subdivision of geologic time that is longer than age but shorter than a period. It is the fourth largest division in geologic time.

Answer 4

Epoch

Question 5

It shows history of environmental change and history of changing organisms.

Answer 5

The Geologic Time

Question 6

It happens when a population of a species goes extinct.

Answer 6

Mass Extinction

Question 7

It is the most recent eon in the Earth’s history. It is the eon in which we live.

Answer 7

Phanerozoic

Question 8

This era is the age of “ancient life”; it started more than 540 million years ago and lasted for more than 300 million years.

Answer 8

Paleozoic Era

Question 9

The massive extinctions triggered by shifts in ocean currents marks the end of this era.

Answer 9

Paleozoic Era

Question 10

The era of “middle life”; the age of reptiles which started at around 245 million years and ended for 180 million years.

Answer 10

Mesozoic Era

Question 11

This era is subdivided into three period: Triassic, Jurassic, and Cretaceous periods.

Answer 11

Mesozoic Era

Question 12

The end of this era was also marked by mass extinction caused by global cooling after meteorites impact the earth.

Answer 12

Mesozoic Era

Question 13

This era is subdivided into Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian geologic periods.

Answer 13

Paleozoic Era

Question 14

This is the era of “recent life”; the age of mammals which began 65 million years ago and continues up to the present.

Answer 14

Cenozoic Era

Question 15

This era was divided into Paleogene, Neogene, and Quaternary periods

Answer 15

Cenozoic Era

Question 16

Mammals became dominant during this era. Mammals have the characteristics to control body temperature, a characteristic that made them survive the climate change that caused the disappearance of dinosaurs.

Answer 16

Cenozoic Era

Question 17

It was believed that birds from this era evolved from dinosaurs.

Answer 17

Mesozoic Era