When the turquoise waters of central Canada's Abraham Lake freeze in the winter, something remarkable happens: spherical patterns and milky blobs, like the contents of a lava lamp, appear under the ice. But these pearl-like bubbles aren’t sunken treasure rising to the surface – they are actually pockets of methane that form when plants, leaves and tree limbs trapped at the bottom of the lake begin to decompose and excrete gas.

Now take a look at some of the oldest photos ever taken in Canada

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