quiz three

Question 1

What era is before the Cambrian

Answer 1

The precambrian is made up of the archaean/proterozoic

Question 2

the oldest rocks are about

Answer 2

4 million years old (older than life)

Question 3

where can you find the oldest rocks/grains

Answer 3

oldest rocks are in Canada but not older grains can be found in australia

Question 4

what is the earth like at this 4.6 gA ago time

Answer 4

constant meteorite bombardment, very gassy cannot breathe

Question 5

how and when does water enter the scene

Answer 5

water comes in at 4.4 Ga. the meteorite bombardment slows

Question 6

when does life originate on earth/ what is it called

Answer 6

3.8 ga - the abiogenesis

Question 7

what is the miller-urey

Answer 7

an experiment that was to try and recreate what the earth’s atmosphere was like

Question 8

miller-urey takeaways

Answer 8

he was able to make amino acids. 12/20 of the most common have now been found

Question 9

and where did this life originate

Answer 9

in deep sea vents or something similar

Question 10

when are the earliest fossils from

Answer 10

3.5 ga

Question 11

what were early fossils like

Answer 11

prokaryote body fossils

Question 12

stromatolites

Answer 12

the trace fossils of microbial life - I guess the first fossils?

Question 13

how are stromatolite formed

Answer 13

sediments trap the little microbial organisms in place. T

Question 14

time period of the stromatolites

Answer 14

-so the atmosphere is low oxygen content
- but this is when the super continent breaks apart, also snowball earth

Question 15

first animal fossils

Answer 15

edicarians
impressions of something that is soft
alive for like the 600-550 period

Question 16

CAMBRIAN EXPLOSION

Answer 16

appearances of many different species in an instant

Question 17

lagerstatte

Answer 17

not sure exactly what it is but since its a shale

so its a series of like really well preserved fossils;

Question 18

when did the east coast form

Answer 18

in the Cambrian

Question 19

taconic orogeny

Answer 19

1st step, the accretion of the taconic island arc

Question 20

Acadian orogeny

Answer 20

2nd step, accretion of the avalonia island arc

Question 21

Alleghanian orogeny

Answer 21

collision of Gondwana back into everything else

Question 22

3 major ingredients feel like this will be a question

Answer 22

solar energy, sphericity, the fact earth is spinning (Coriolis effect)

Question 23

where do you find coals

Answer 23

places where there is precipitation as well as warmth

Question 24

where do you find evaporites

Answer 24

where it is dry and coastal

Question 25

where do you find the sand dunes

Answer 25

where it is dry and continental

Question 26

warm currents come from….

Answer 26

low latitudes

Question 27

cool currents come from…

Answer 27

high latitudes

Question 28

reefs

Answer 28

warmth + downwelling

Question 29

oil

Answer 29

upwelling productivity