NGSS
Eon explained in an easy to understand way.
Eon
The largest unit of the geologic time scale, it is divided into eras, periods, and epochs. Eon It's a really long period of time when big things happen on Earth.
Epoch explained in an easy to understand way.
Epoch
A unit of geologic time longer than an age but shorter than a period. Epoch. In simple terms for Grade 2, an epoch is a long time in Earth's history when something special happened, like the time when lots of dinosaurs lived.
Era explained in an easy to understand way.
Era
The second-longest unit of geologic time, it is divided into periods. Era. An era is a long time in Earths history when big changes happened.
Evolution explained in an easy to understand way.
Evolution
The change in a species over time. Evolution. Evolution means living things change and adapt over many generations to fit their environment better.
Geologic time scale explained in an easy to understand way.
Geologic time scale
A timeline of Earth's history based on major changes. Geologic time scale. The geologic time scale is a way to show Earth's history by dividing it into times when big changes happened.
