Chapter 19

Question 1

The global ocean covers percent of Earth’s surface

Answer 1

71

Question 2

first organisms to inhabit Earth

Answer 2

3.8 ga

Question 3

Existence of atmosphere

Answer 3

2.2 billion

Question 4

is the informal name for the span that begins at Earth’s formation and ends with Earth’s earliest-known rocks

Answer 4

Hadean

Question 5

The Precambrian accounts for about _% percent of geologic time

Answer 5

88

Question 6

Our galaxy forms

Answer 6

10 GA

Question 7

Solar nebula begins to contract

Answer 7

4.7 ga

Question 8

78 percent nitrogen,_ percent oxygen, about 1 percent argon (an inert gas)

Answer 8

21

Question 9

whichtheir solar winds are very intense

Answer 9

T-Tauri phase

Question 10

_through which gases trapped in the planet’s interior are released

Answer 10

outgassing

Question 11

represent the world’s most importantreservoir of iron ore

Answer 11

BiF

Question 12

Where o3 is conc.

Answer 12

Stratosphere

Question 13

Means (“ancient age”)

Answer 13

Archean eon

Question 14

Means “early life”

Answer 14

Proterozoic eon

Question 15

eukaryotes appeared?

Answer 15

2.7 GA

Question 16

Rocks older than 3.5 GA

Answer 16

Acasta, univak, Minnesota, Wyoming, itsaq, Sao Francisco, anshae, aldan, edenbyland, narryer, barberton

Question 17

built the North American craton

Answer 17

Trans Hudson orogeny

Question 18

large landmasses thatcontain all, or nearly all, the existingcontinents

Answer 18

Supercontinent

Question 19

Most recent supercontinent

Answer 19

Pangaea

Question 20

Formation of rodinia

Answer 20

1.1 GA

Question 21

Assemblage on the s. Hemesphere by the end of precambrian

Answer 21

Gondwana

Question 22

Gondwana comprised of present day (5)

Answer 22

S. America, aus, India, Antarctica, Africa

Question 23

Phanerozoic eon, encompasses _ million years and is divided into three eras:

Answer 23

542, Paleozoic, Mesozoic, and Cenozoic.

Question 24

Spanning about 186 million years

Answer 24

Mesozoic era

Question 25

Jurassic deposit is the _—the world’s richest storehouse of dinosaur fossils

Answer 25

Morrison Formation(jurassic)

Question 26

Orogeny towards end of mesozoic

Answer 26

Laramide orogeny

Question 27

Era of recent life

Answer 27

Cenozoic era

Question 28

encompasses the last 65.5 million years of Earth history

Answer 28

Cenozoic Era

Question 29

Eukaryotes are 2.1 GA yrs old. T or f

Answer 29

T

Question 30

appearance, includingjellyfish, sponges, worms, mollusks (clams, snails) arthropods

Answer 30

Cambrian

Question 31

Soft bodied org are preserved (name the formation)

Answer 31

Burgess Shale,, Canadian rockies

Question 32

golden age of trilobites

Answer 32

Cambrian

Question 33

The _ marked theappearance of abundant cephalopods

Answer 33

Ordovician

Question 34

Ordovician range

Answer 34

488-444 ma

Question 35

first upright-growing (vascular)plants.

Answer 35

Silurian

Question 36

First tree sized land plants

Answer 36

Devonian

Question 37

Extensive land plants from which coal deposits develop

Answer 37

Pennsylvanian

Question 38

Age of fishes

Answer 38

Devonian

Question 39

The _ extinction was the most significantof at least five mass extinctions thatoccurred over the past 500 million years.

Answer 39

latePermian

Question 40

First true terrestrial vertebrates

Answer 40

Reptiles

Question 41

Age of reptiles

Answer 41

Mesozoic

Question 42

Element found in stony meteorite

Answer 42

Iridium

Question 43

Age of flowering plants/age of mammals

Answer 43

Cenozoic

Question 44

2 grps of mammals

Answer 44

Marsupials and placentals