Earth Biography

Question 1

There were 4 Eons, what are they? In order of earliest to recent.

Answer 1

Hadean eon
Archean Eon
Proterozoic Eon
Phanerozoic Eon

Question 2

What happened during the Hadean Eon?

Answer 2

The Earth was very hot. It cooled off and oceans were created.

Question 3

What happened during the Archean Eon?

Answer 3

Substantial quantities of rocks began to appear on the crust and a few simple forms of life appeared.

Question 4

What happened during the Proterozoic Eon?

Answer 4

The continents grew and the Earth became oxygen rich. Simple organisms became complex.

Question 5

What three Eras is the Phanerozoic Eon split into?

Answer 5

Plaeozoic
Mesozoic Era
Cenozoic

Question 6

What six periods belong to the paleozoic era?

Answer 6

Cambrian
Ordovician
Silurian
Devonian
Carboniferous
Permian

Question 7

What three periods belong to the mesozoic era?

Answer 7

Triassic
Jurassic
Cretaceous

Question 8

How many mass extinctions have occurred on the Earth?

Answer 8

5

Question 9

What ended the paleozoic era?

Answer 9

The permian extinction. 90% of all marine species were eradicated.