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Mo's Iceland photos
@mo@icelandphotos.co.uk  ·  activity timestamp last month

Flour Power

Downstream from Dettifoss in north-eastern #Iceland is one of the deepest parts of Jökulsárgljúfur¹ canyon. This area is known as Hafragil ravine.

Hafragilsfoss roars within it, ≈ 27m (79ft) high and 91m (299ft) wide.

The white colouration of the water is caused by a suspension of rock flour, fine-grained particles of silt generated by the grinding of bedrock by glacial erosion.

¹ 𝙔𝙤𝙝-𝘬𝘭𝘭-𝘴𝘰𝘸𝘳𝘳-𝘨𝘭𝘺𝘰𝘰-𝘧𝘷𝘳𝘳

@photography

#WaterfallWednesday #Iceland2025 #LandscapePhotography

A colour photo of a waterfall plunging over a steep drop on a canyon floor. The water is white from turbulence but also from the particles being carried by it. Where the rockface is visible behind the water, it is a smoothed black surface. The foreground is the canyon edge and is covered in green mosses. The far wall is layered dark volcanic rock. There is a large amount of spray forming a dense mist at the waterfall's base.
A colour photo of a waterfall plunging over a steep drop on a canyon floor. The water is white from turbulence but also from the particles being carried by it. Where the rockface is visible behind the water, it is a smoothed black surface. The foreground is the canyon edge and is covered in green mosses. The far wall is layered dark volcanic rock. There is a large amount of spray forming a dense mist at the waterfall's base.
A colour photo of a waterfall plunging over a steep drop on a canyon floor. The water is white from turbulence but also from the particles being carried by it. Where the rockface is visible behind the water, it is a smoothed black surface. The foreground is the canyon edge and is covered in green mosses. The far wall is layered dark volcanic rock. There is a large amount of spray forming a dense mist at the waterfall's base.
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Travis F W
@travisfw@fosstodon.org replied  ·  activity timestamp last month

@mo @photography never heard silt called rock flour. that would be some gritty bread though. lots of it in Alaska (where I grew up) too.

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Mo's Iceland photos
@mo@icelandphotos.co.uk replied  ·  activity timestamp last month

@travisfw
Yes, it is a real thing!
https://en.wikipedia.org/wiki/Rock_flour

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Travis F W
@travisfw@fosstodon.org replied  ·  activity timestamp last month

@mo we just called it glacial silt. it can turn liquid under your feet if you stand on it for a minute.

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