Geologic time scale

Question 1

a record of life forms and geological events in earth’s history

Answer 1

geologic time scale

Question 2

remnant, impression, or trace of an animal or plant of a past geologic age that has been preserved in Earth’s crust

Answer 2

fossils

Question 3

primary source of information about the history of life on earth

Answer 3

fossil record

Question 4

largest division, 2 billion years ago

Answer 4

eons

Question 5

4.5 million years, 88% of earth’s history

Answer 5

precambrian

Question 6

Precambrian

Answer 6

Hadean, Archean, Proterozoic

Question 7

divisions that span time periods of tens to hundreds of million years

Answer 7

era

Question 8

ancient or old life. 540 million years. invertebrates

Answer 8

paleozoic era

Question 9

no more than 100 million years

Answer 9

periods

Question 10

burst of new life

Answer 10

cambrian explosion

Question 11

sponges, trilobites

Answer 11

cambrian period

Question 12

invertebrates, jawless armored fish

Answer 12

Ordovician period

Question 13

corals, fish, cooksonia

Answer 13

silurian period

Question 14

branching vascular plant

Answer 14

cooksonia

Question 15

primitive plants lobe-firmed fishes, seed plant became common

Answer 15

devonian period

Question 16

amphibians, carboniferous forest, widespread forests of huge plants left massive deposits of carbon turned to coal

Answer 16

carboniferous period

Question 17

could breathe with air

Answer 17

lobe-finned fishes

Question 18

land masses formed the supercontinent pangaea. extreme temperature, dry climate. ended with the biggest extinction known as permian extinction

Answer 18

permian period

Question 19

middle life, 280 million years ago. age of reptiles, era of dinosaurs

Answer 19

mesozoic era

Question 20

dinosaurs colonized land, air, and water. seed ferns, conifers dominated the forests. pangaea separated into 2 : Laurasia, gondwanaland. Mass extinction

Answer 20

triassic period

Question 21

Pangaea separated into 2

Answer 21

Laurasia, Gondwanaland

Question 22

golden age of dinosaurs, earliest birds evolved

Answer 22

jurassic period

Question 23

dinosaurs reached their peak size, climate was warm, poles lacked ice, dramatic extinction

Answer 23

cretaceous period

Question 24

recent life, 65 million years ago to present, age of mammals

Answer 24

cenozoic era

Question 25

climate was warm and humid, mammals = primate, flowering plants and insects were numerous and widespread

Answer 25

tertiary period

Question 26

ice ages. sea levels fell. wooly mammoths adapted to the cold by evolving very large size and thick fur

Answer 26

quartermary period

Question 27

smallest division of the geologic time scale

Answer 27

epoch