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Two forked bolts of lightning striking down from dark clouds over a calm sea at night, with a lit coastline and hills on the left and green rocks on the grassy shore in front. — Lightning Ioannis Daglis

Steeply tilted rock layers alternating dark brown and pale grey, their eroded edges forming jagged saw-toothed ridges like stylised mountains against a pale blue sky. — Stylized “mountains” of the Basque Coast Maela Baldan

Rows of crescent-shaped spots of sunlight from a partially eclipsed sun cast on a grey wall inside a wooden shelf, above a red journal reading Optics Communications. — Suns eclipsed in a lab library Claudine Vanbauce

Dark storm clouds over layered silhouettes of mountain ridges, with rays of light breaking through a gap and a band of pale sky above the hills. — Storm is coming Nadine Hoffmann

Pool of vivid blood-red water reflecting pale clouds, edged by a crust of yellow and white deposits and surrounded by dark grey heaps of mine waste rubble, with a second red pool behind. — Rouge Joaquín Delgado

Thin white waterfall streaming down a sheer, cracked grey rock wall, with yellow and green autumn shrubs and trees at its foot. — Norway-Troll Fjord 4 Sokratis Nikoglou

Deep crater in dark volcanic cinder on a high mountainside, its rim streaked with reddish-brown ash, with winding tracks, more rounded cones and a row of white posts on the slopes beyond under cloud. — Crater landscape Mt Etna Madelon Smink

Aerial view of a river winding in tight loops through green forest and fields, with a plume of white smoke rising from the left and haze veiling the distance. — After the Filter of Haze Wuquan Cui

Pointed silver metal building shaped like a giant crystal on a rocky mountain summit, a grey GNSS antenna mast with a green dome in front, metal walkways below and hazy mountain ranges under a deep blue sky. — Geodesy on Zugspitze Christian Voigt

Small red sun just above a dark hilly skyline, with long streaks of wispy cloud in pink, gold and blue stretching across the evening sky. — Sunset over the desert 2 Roy Yaniv

Video of a flight over an Arctic landscape seen from an aircraft window, the engine and wing at the top, above a broad crevassed glacier, brown gullied mountains and an icy fjord. — Svalbard Flyover Matthias Buschmann

Sunset over a dark, calm sea, with streaks of red and orange cloud along the horizon, dark puffy clouds in the foreground and grey layered clouds higher up. — Twilight at the Strait of Malacca — A Golden Exit from Asia's Maritime Crossroads Junshu Lin

Huge bucket-wheel excavator with a sign reading RWE working on a terrace of a deep grey open-pit mine, with stepped slopes and conveyor belts behind. — Open pit lignite mining Stephan Sprinz

Small waterfall pouring into a round milky-blue pool carved in stepped, layered grey limestone, in a narrow gorge with an old stone bridge, a person and autumn trees beyond. — The Papingo’s rock pools Athanasios Serafeim

Thin white streams of water pouring over dark wet rock streaked with orange and green, with lush bushes and moss growing along the top edge. — Close up of Hraunfossar Martine van der Ploeg

Smoke rising from a small fire on the ground of a misty yard between houses with tiled roofs, where a crouching person holds a child wearing a red hood and another person stands behind. — Infants and air pollution! Parth Sarathi Mahapatra

Buried Soil Antonio Girona-García

Cut bank of dark brown, almost black peat with fine roots and dry grass hanging over its edge, topped by green grass and small yellow flowers. — Peatland Antonio Jordán

Aerial view of a dull, snow-dusted lowland with a winding river, looping meanders, oxbow lakes and frozen channels among dark patches of shrubs. — Yamal's art Artyom Sheludkov

Paricutin volcano ashes (Mexico) Antonio Jordán

Rocky coastline at dusk with waves breaking white over dark rocks, a calm pinkish sea and a distant headland with a few buildings under a pink sky. — Peruvian dessert coast Sandro Makowski

Wide steep slope covered by dark grey and black lava flows streaming down from a ridge and spreading across the plain below, between patches of green vegetation. — Holei Pali Martin Mergili

Steep grey granite wall streaked with cracks and patches of moss and shrubs, dropping to a smooth rock ledge at the edge of dark green water. — Norway-Troll Fjord 3 Sokratis Nikoglou

Pillar of red-brown conglomerate full of pebbles and boulders, topped by a flat cap of harder rock like a mushroom, with a smaller pebble pillar in front. — Mushroom rocks near Nachola in northern Kenya Martin H. Trauth

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