The National Park Service says blue ice doesn't contain many air bubbles. In a lake, sometimes weather conditions — such as a lack of high winds — allow water to freeze slowly and evenly ...

Lake beds like those explored by Nasa's Curiosity ... Beneath this, researchers spotted something unusual 1.5km under the ice. "In light blue you can see where the reflections from the bottom ...

Shards of blue-tinged ice, pushed by water current and wind, sit atop the shore of Lake Superior near Stony Point in 2022. (David Joles/The Minnesota Star Tribune) Ice shove: When large slabs of ...