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Cone-shaped volcano at night with a small orange glow and a lava streak at its summit, wrapped in pale cloud under a starry sky, with a tree and bushes in the foreground. — Fuego volcano at night from a local football pitch Rick Thomas

Close-up of a thin sheet of clear water flowing over a dark boulder, its rippled surface shining silver and gold with reflected light against a blurred background. — Springwater floating over a boulder reflecting the evening sky Reinhard Teschl

Sandy beach strewn with many small shells in orange, white, grey and blue, with white-capped waves breaking behind in evening light. — Expelled from the sea Adrian Marius Sova

Computer-rendered simulation of a raindrop striking water: a crown-shaped splash of clear water flinging droplets upward, with circular ripples on a flat surface set against clouds and snowy peaks. — 132 Megapixel image of simulated raindrop impact Moritz Lehmann

Group of people in hard hats standing on a ridge at the foot of a huge streaked crater wall in grey, green and red, with white steam billowing up on the left. — White Island excursion Markus Benninghoff

Snow Monitoring Expedition Maksim Cherviakov

Long line of people silhouetted along the edge of shallow water on a flat sandy shore with tyre tracks, under a cloudy evening sky with distant mountains. — Revival Arash Modaresi Rad

Calm hazy sea with pale curving streaks on its surface, below distant mountains tinged pink in soft evening light, with a dark shrub-covered slope in the foreground. — Quiet gulf Romain Hemelsdael

Pale rays of light fanning upwards across a blue-grey evening sky from behind a dark bank of cumulus clouds, the hidden sun glowing through a gap at the bottom. — Crepuscular rays Konstantinos Kourtidis

Two bright rainbow fragments shining through dark grey rain clouds over a calm grey lake, with a sunlit rocky headland and hills on the far shore. — Double rainbow over a Tibetan Plateau lake Janneke IJmker

Pointed grey boulder in a round pool of still turquoise water on a flat sandy beach, with curving sand patterns leading to it and a snow-covered mountain under a dark sky behind. — Where Mountains Meet the Sea Glenn Strypsteen

Bright sun inside a large circular halo with a coloured bright spot, a sundog, on each side, above dark conifers, bare trees, a misty hillside and the roof of a building. — A glittering morning -- solar halo with sundogs Daniela Domeisen

Huge dark grey billowing cloud of volcanic ash rolling down towards green forested hills, seen from beside a pale wall. — Partial Dome collapse at Soufrière Hills, Montserrat (2010) Jean-Guillaume Feignon

Close-up of clear lake ice with a pale, veil-like fracture zone running down the middle, surrounded by countless small white bubble trails against dark water. — ice patterns in Rocky Mountain National Park Ellen Wohl

Ground of grey gravel forming a pattern of rounded rings of coarser stones around finer centres, with a small green-handled tool for scale. — Stone circles, Byers Peninsula, Antarctica Marc Oliva

Cliff of grey hexagonal basalt columns, curved and fanning in different directions, rising above a black beach where a small person stands at the base for scale. — Basalt colums at Reynisfjara Sarah Weick

Video of a dark storm cloud with a broad, low base spreading over a flat ploughed field, with green-grey cloud on the right and a thin band of orange light along the horizon. — Storm Relative Airflow Michiel Baatsen

Sea ice dotted with many irregular pools of meltwater stretching to a foggy horizon, under a pale hazy sun that glints on the ponds. — Melt Ponds on Arctic Sea Ice Kai Boggild

Salt flat of white crusty salt broken into raised ridges and cracked plates, stretching to a line of hazy mountains under a bright sky. — Stormy salt Giulia Vico

Close-up of a dark biotite gneiss with a rounded purple garnet in the centre, surrounded by glassy grains, black and orange-brown flakes and scattered pale brassy sulphide patches. — Garnet with sulphide inclusions in a Precambrian biotite gneiss from the Alutaguse zone, East Estonia. Sophie Graul

Large rusty yellow electric mining shovel numbered 175 standing on caterpillar tracks in an open-pit quarry, beside a pile of grey rock blocks, with another shovel and terraced quarry walls in mist behind. — Quarry Bear stream, Norilsk Nikolay Zhukov

Broad volcano with two summits rising beyond a calm grey bay with a few boats, under heavy clouds, with motorboats moored at a marina in the foreground. — Vesuvius from Castel del Uovo Maria Bostenaru Dan

View through a hole in rough grey limestone onto a forest of tall, razor-sharp grey limestone spires rising among green tropical plants. — Through the hole Juliane Krenz

Pale turquoise lake held in a hollow among grey ice and rock pinnacles, below dark debris-covered ice ridges streaked with white snow. — Glacial lake Zervas Efthimios

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