What are the three major eras?

The three major eras are like different chapters in a very long story about Earth.

Imagine you just got a brand-new toy box, that’s what Earth was like in the first era. Everything was starting out, and there weren’t any people or animals yet. It was all rocks, lava, and steam. This is when Earth was still getting its shape.

Now picture your toy box filling up with toys, that’s what happened in the second era. Tiny creatures started appearing, like little bugs and fish. Then came bigger ones, like dinosaurs and trees. It was like a big party of life growing and changing all over Earth.

Finally, it's like when you start playing with your favorite toys, that’s the third era. Humans showed up and started building cities, painting pictures, and exploring the world. This is the time we're living in right now!