HISTORY OF LIFE ON EARTH

Question 1

is a home for all living organisms

Answer 1

earth

Question 2

age of earth

Answer 2

4.6 billions of yrs existing

Question 3

A record of life forms and geological events in Earth’s history.

Answer 3

geologic time scale

Question 4

are a set of principles that describe how rock layers are deposited and change over time. These laws are used to identify strata and understand Earth’s history.

Answer 4

stratigraphic laws

Question 5

4 types of stratigraphic laws

Answer 5

1. law of superposition
2. law of original horizontally
3. law of cross-cutting relationships
4. law of inclusions

Question 6

what is the 4 geologic time scale

Answer 6

1. eon
2. era
3. periods
4. epochs

Question 7

The largest division of geologic time scale; half billion to nearly billions of years.

Answer 7

eons

Question 8

periods of tens to hundreds of million years

Answer 8

era

Question 9

no more than million of years

Answer 9

periods

Question 10

2 types of eons

Answer 10

precambrian
phanerozoic

Question 11

88% of the Earth’s History

Answer 11

precambrian

Question 12

what is the 3 precambrian eons

Answer 12

1. hadean
2. archean
3. proterozoic

Question 13

derived from the word Hades (god of the underworld in Greek mythology)

Answer 13

hadean eon

Question 14

Presence of oxygen due to the emergence of cyanobacteria.

Answer 14

proterozoic eon

Question 15

primitive organisms

Answer 15

cyanobacteria

Question 16

Present eon which subdivided into 3 Era; Paleozoic, Mesozoic, Cenozoic.

Answer 16

phanerozoic

Question 17

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

Answer 17

fossils

Question 18

study of fossils

Answer 18

paleontology

Question 19

study of rocks

Answer 19

petrology