Earth and Science

Question 1

is a record of life forms and geologic events in Earth’s history.

Answer 1

Geological Time Scale

Question 2

Sometimes it is possible to distinguish layers of rock that formed during a single year or season.

Answer 2

Dividing Geological Time

Question 3

thick stacks of rock that have no fossils provide little information that could help in subdividing geologic time.

Answer 3

Dividing Geological Time

Question 4

A record of how Earth and its life forms have changed through time. For example, the scale shows when life first appeared on Earth.

Answer 4

Geological Time Scale

Question 5

In the geologic time scale, time is divided into bigger blocks than years or centuries. The scale begins when Earth formed __________ years ago and goes to the present.

Answer 5

4.6 billion years ago

Question 6

The geologic time scale is divided into (4)

Answer 6

Eons, Eras, Periods, and Epochs

Question 7

TRUE OR FALSE
divisions of the geologic time scale have no fixed lengths.

Answer 7

TRUE

Question 8

changes or events recorded in

Answer 8

Rocks and Fossils

Question 9

The largest unit of time

Answer 9

Eon

Question 10

is an extremely long, indefinite period of time.

Answer 10

Eon

Question 11

Earth’s 4.6-billion-year history is divided into 4

Answer 11

Precambrian, Paleozoic, Mesozoic, Cenozoic

Question 12

Paleozoic is divided into __ periods.

Answer 12

6 periods

Question 13

The _________ Period is important because it is the first period after Precambrian Time.

Answer 13

Cambrian Period

Question 14

The periods of the Cenozoic, the most recent era, are further divided into _______

Answer 14

Ephocs

Question 15

Present day Earth is in the _________ era and the Quaternary period in the Holocene epoch.

Answer 15

Cenozoic Era

Question 16

Geologic time has NOT Ended!

Answer 16

TRUE

Question 17

Humans First Appeared

Answer 17

Pleistocene

Question 18

Explosion of life

Answer 18

Cambrian Period

Question 19

Age of man

Answer 19

Quaternary Period

Question 20

no plants or animals existed, and multicellular organisms develop

Answer 20

Precambrian Period

Question 21

LIFE EXPLODES! At the beginning of the ____________, all life lived in the oceans.

Answer 21

Paleozoic Era

Question 22

Early invertebrates developed and later reptiles became dominant on land.

Answer 22

Paleozoic Era

Question 23

Early plant included simple mosses, ferns, and cone-bearing plants.

Answer 23

Paleozoic Era

Question 24

(Age of the Reptile/Dinosaurs
Dinosaurs lived along with the first mammals, birds, and flowering plants.

Answer 24

Mesozoic Era

Question 25

Reptiles were dominant.

Answer 25

Mesozoic Era

Question 26

The diversity of life forms increased.

Answer 26

Cenozoic Era

Question 27

New mammals and birds appeared while other became extinct.

Answer 27

Cenozoic Era

Question 28

Flowering plants became most common.

Answer 28

Cenozoic Era

Question 29

Geologic time is divided into units based on

Answer 29

Rocks and Fossils

Question 30

Precambrian Time

Answer 30

4.6 billion years ago

Question 31

Paleozoic Era

Answer 31

544 million years ago

Question 32

Mesozoic Era

Answer 32

225 and 65 million years ago

Question 33

Cenozoic Era

Answer 33

65 million years ago to present day