Earth Science: History of the Earth (EONS AND PERIODS)

Question 1

-Metamorphic rocks, igneous rocks (Molten rock) (Volcanic activity)

Answer 1

Hadean (Era)

Question 2

(Multicellular/Eukaryotic and Unicellular/Prokaryotic) (Bacteria)

Answer 2

Archean (Era)

Question 3

(Ferrous Oxide/Iron and Oxygen) (Increase Iron, Oxygen) (Iron Water, High Iron content) (Start of photosynthesis) (Then produced oxygen)

Answer 3

Proterozoic (Era)

Question 4

Fossils of shells (“Ancient Life”)

Answer 4

Paleozoic (Era)

Question 5

(Pangea formation) (Extreme weather) (75% Amphibians, 80% Marine life)

Answer 5

Cambrian (Period)

Question 6

(Sea life came back) (Age of fishes) (Dominance and diversification of fish)

Answer 6

Devonian (Period)

Question 7

(Coal deposits) (Coal produced by swamps) (Trees become abundant) (Lakes/Rivers /Water forms formed) (Activated charcoal then activated carbon)

Answer 7

Carboniferous (Period)

Question 8

(Coal deposits) (Coal produced by swamps) (Trees become abundant) (Lakes/Rivers /Water forms formed) (Activated charcoal then activated carbon)

Answer 8

Carboniferous (Period)
{Mississippian – L M U (Epoch)
{Pennsylvanian – L M U (Epoch)

Question 9

(Dinosaurs)

Answer 9

Mesozoic (Era)

Question 10

(Ice age) (1st Human)

Answer 10

-Pleistocene (Epoch)

Question 11

(Up until the present)

Answer 11

-Holocene (Epoch)