The Proterozoic eon is the longest era in the history of the Earth.

This is the most beautiful flower.

The Eoarchean eon is the oldest era in the history of the Earth.

The Proterozoic eon is the longest era in the history of the Earth.

Earth is one of the planets in the solar system.

The Neoproterozoic era was a very important period in the history of the Earth.

His hair is very long.

He is interested in history.

Living in this age is very exciting.

His wedding was truly magnificent.