(2) Blue Planet


Earth's Age

Earth is believed to be 4.5 billion years old. The age of Earth is calculated using radioactive decay and carbon dating. These methods are used to calculate the age of rocks and organic matter, which provide us with an approximate idea of the age of Earth.


The age of Earth is divided into 4 eons:

Hadean, Archean, Proterozoic, and Phanerozoic.


The Holocene epoch is the present geological period that extends from the present day to about 10000 BCE.

During the Hadean era, there were no oceans on Earth and no oxygen in the atmosphere.

Life began on Earth around 4 billion years ago.

Oxygen on Earth was produced as a waste product of photosynthesis.

The first multicellular plants emerged around 1 billion years ago.

Supercontinent Pannotia was formed around 600 million years ago.

Fish evolved around 530 million years ago.

The recent supercontinent Pangea existed from 300 to 180 million years ago.

Modern humans originated around 200,000 years ago.

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