geological column

Question 1

what are the 3 eras?

Answer 1

Paleozoic
Mesozoic
cenozoic

Question 2

Which was the first era

Answer 2

Paleozoic

Question 3

what was the second era

Answer 3

mesozoic

Question 4

what was the 3rd era

Answer 4

cenozoic

Question 5

which periods are in the Paleozoic

Answer 5

Cambrian (odrdovicain, silurian, devonian carboniferous) Permian

Question 6

which periods are in the mesozoic

Answer 6

Triassic (jurassic) Cretacous

Question 7

which periods are in the phenozoic

Answer 7

tertiary-quaternary (recent)

Question 8

how are the eras divided?

Answer 8

by mass extinction events permo-triassic and K-T

Question 9

how were the eras established

Answer 9

by relative dating (using fossils)

Question 10

how was the LENGTH of eras worked out

Answer 10

radiometric dating

Question 11

which era contains tertiary and Quaternary periods

Answer 11

Cenozoic

Question 12

which era contains Cambrian (Ordovician Silurian Devonian carboniferous) -Permian

Answer 12

Paleozoic

Question 13

which era contains Triassic Jurassic and Cretaceous

Answer 13

Mesozoic