EARTH'S BIOGRAPHY

How did earth form?
Earth first formed from ball of dust, rock and ice in space. Then a dense iron core forms in the center of the earth. Hydrogen and helium formed the atmosphere. After that volcanic eruption released carbon dioxide. Ocean then formed on earths surface. After that early organism released oxygen into air.

Precambrian Time
4600 - 542 (million)
Precambrian time had no life and also mostly only volcanic eruption

Cambrian
Cambrian time lasted from 542-488 million years ago
Shallow sea covered much of the land. Ancient continent lie near south equator.

Ordovician
Ordovician lasted 488-444 million years ago
Warm shallow sea covers much of the earth. Ice cap covers what now is Africa.

Silurian
Silurian lasted from 444-416 million years ago.
Coral leafs develop. Early continents collide which is now North America.

Devonian
Devonian lasted from 416-359 million years ago.
Sea rise and fall over what is now North America.

Carboniferous
Carboniferous lasted from 359-299 million years ago.
Early mountains form, and North Africa and Europe is in tropical region.

Permian
Permian lasted from 299-251 million years ago.
Desert became larger in tropical zone. Pangea forms as all continents join together.

Triassic
Triassic time lasted from 251-200 million years ago.
Pangea hold together for most of the Triassic. Hot, dry condition dominates the Pangea.

Jurassic
Jurassic lasted from 200-146 million years ago.
Pangea breaks apart and North America collides away from Africa and South America.

Cretaceous
Cretaceous lasted from 146-66 million years ago.
Continents moves to their present-day position, and South America splits with Africa.

Paleogene
Paleogene lasted from 66-23 million years ago.
Australia becomes their own continent. Heavy volcanic eruption occurred.

Neogene
Neogene lasted from 23-1.8 million years ago.
Climates changes frequently. More grassland, Andes and Himalyas form. North and South America got connected.

Quaternary
Quaternary lasted from 1.8million years ago to present!
Thick glaciers advance over much of North America and Europe, parts of South America, and Asia, and all of Antarctica.

SOURCES

• I used my science text book
• The earth forming video
• Pictures from Haiku Deck