The horizon in geology is like looking at a cake that has different layers. Each layer has a different color or texture, kind of like how the layers in a rainbow cake have different colors. The horizon is the layer that separates two different layers in the ground.
The different layers can tell us a lot about what happened in the past. It's like looking at a bunch of books and being able to read the story by looking at their covers. Each layer represents a different time in history, kind of like how different chapters in a book tell a different part of the story.
Geologists use the horizon to help them figure out the history of the Earth. By looking at the different layers, they can tell what kind of environment existed during that time, whether it was a dry desert or a wet swamp. They can also tell if there were any volcanic eruptions or natural disasters that happened during that time.
Overall, the horizon is just a fancy word for the layer that separates two different layers of the Earth. Geologists use it to learn about the past and understand the history of the Earth.