An upside down channel This is an esker, one of the coolest features left behind by glaciers. Glaciers are big sheets of ice that carry lots of sediment and sometimes melt. When a glacier melts, it produces streams of flowing water on and within the. Earth And Space Science, Science And Nature, Glaciers Melting, Cairngorms, Plate Tectonics, Arts Integration, Beneath The Surface, Aerial Photography, Natural World