Okay kiddo, have you ever seen the color blue? And have you ever seen the color green? Well, when we talk about "blue-green," we're actually talking about a color that is a mix of both blue and green!
Think about when you mix paint or Play-Doh together - if you mix blue and green together, you'll get a new color that is both blue and green at the same time. That color is what we call blue-green!
In nature, you might see blue-green colors in things like the ocean or a lake, where the water can look blue in some places and green in others. Sometimes, if you look really closely, you might even see tiny organisms called algae that can give the water a blue-green tint.
So remember, blue-green is a color that combines blue and green, and you might see it in things like water or plants. Cool, huh?