eras

Eras are large periods of time used by scientists to categorize Earth's history, similar to chapters in a book. Each era reflects significant changes in the planet's geology, climate, and life forms. For example, the Mesozoic Era is known as the age of dinosaurs, while the Cenozoic Era is when mammals became dominant. These divisions help us understand how Earth and its life have evolved over millions of years, highlighting major events like mass extinctions, climate shifts, and the rise of different species. Eras are part of a structured timeline that organizes Earth's history into manageable, meaningful segments.