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

The Mesoarchean eon is a part of Earth's history, which lasted from about 3 billion years ago to about 2.8 billion years ago.

This is the most beautiful flower.

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

He is interested in the history of the past.

This old house is the one where my grandparents lived.

This old building tells the history of our town.

Living in this age is very exciting.

We had a picnic in the field.

He is interested in history.