Okay kiddo, have you ever seen a big pile of snow that has melted and turned into a river? That's kind of like what glaciofluvial means.
Let's break it down. "Glacio" means "ice." You know how snow is made of tiny ice crystals? Glaciers are huge masses of ice that can be as big as whole mountains! So when we say "glacio," we're talking about ice.
"Fluvial" means "river." You know what a river is, right? It's when water flows downhill in a kind of stream. So when we say "fluvial," we're talking about rivers.
Now, when a glacier starts to melt, it can turn into a river. But this river is different than a normal river because it's flowing from melting ice! The water in glaciofluvial rivers can be really cold because it came from ice. And sometimes, the water can be full of rocks and sediment that the glacier picked up along the way.
Overall, glaciofluvial just means a river that's flowing from melted ice instead of rain water. It's a big word, but it's not too complicated once you know what the parts mean!