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Fresh volcanic bomb shattered into grey angular blocks in a shallow pit in dark ash, with a hammer, a drink bottle and the legs of two people standing nearby. — Fresh Volcanic Bomb at Suwanosejima volcano, Japan Haruhisa Nakamichi

Blurry magnified close-up seen through an eyepiece: countless tiny bright beads and grains glinting yellow and white on a dark grey paste. — Microplastic in cosmetics Costantina Cossu

Close-up of clear icicles hanging side by side, full of tiny bubbles that sparkle gold in low sunlight, against a soft grey and pink background. — Morning sunlight reflected by icicles Katja Laute

Branching lightning bolts across a purple night sky, beside the silhouette of a rooftop with a mast of television aerials. — Thunderstorm in Mainz Dirk Dienhart

Two side-by-side photos of a soil auger in dark grey volcanic ash: on the left pushed deep into the layered ash, on the right lifting reddish-brown clayey soil from below. — Paleosoil below volcanic ash Antonio Jordán

Close-up of a tiny branched snow crystal on dark grey woven cloth, with a few smaller crystals and ice grains scattered around it. — Snow crystals on a piece of cloth Reinhard Teschl

Luvic Glossic Planosol Cezary Kabala

Close-up of a deep red garnet, bent and partly broken along its lower side, set in a dark, glittering mica-rich rock with pale and rusty patches. — Sheared and rotated almandine garnet in Precambrian gneiss from Estonia Sophie Graul

Weathered wooden hut with a white banner on its wall under a starry night sky, with the Milky Way rising above it and a thin streak of light at the right. — The Milky way over the West coast of Sweden Henrik Drake

Thick white plume of smoke rising from yellow sulphur deposits at the bottom of a grey volcanic crater, beside a turquoise crater lake, with tiny people near the vents. — The Crater of Ijen Mount Sunaryo Hasan

Aerial view of a glacier winding along a valley floor between steep brown rock mountains, splitting into white ice tongues on dark debris, with snowy peaks and clouds behind. — Bivouac Glacier Martin Mergili

Video of a wide river channel filled with dark grey boulders between lush green vegetation, with muddy water flowing on the left and a haze of steam rising upstream. — Lahar front at Semeru volcano, Indonesia Franck Lavigne

Large rounded iceberg of bright blue ice floating on dark blue water, with other white and dark streaked ice behind it under a grey stormy sky. — Fieldwork on Jökulsárlón lagoon Baptiste Gombert

Yellow slab of rock with dark, finely branching dendrites spreading across it like fern fronds, lying on a dark blue cutting mat with a white grid. — Labyrinth of mineral leaves Antonio Jordán

Ptygmatic fold in a dark grey boulder: pale pink veins twist through the rock in tight, irregular zigzag loops, with a black pen for scale and sand at the base. — The ptygmatic fold in nature, South Sinai, Egypt Metwally Hamza

Close-up of dark grey limestone packed with fan-shaped fossil shells, their fine radiating ribs catching the light as they emerge at different angles from the rock surface. — Coming to light, from the darkness of the past Giuliana Rossi

Field of grey ropy lava covering a road, with two half-buried signs sticking out of it, a yellow one reading Reduced Speed 25 and a white one reading No Parking. — Recycled lost road with relevant signs Kurt Varmuza

Grey rocky surface packed with rounded, roughly circular nodules like cobbles, with a black and white scale bar laid across. Caption reads Crater lake oncolitic pavement. — Oncolites Hugo Beraldi

Gravel ground patterned by a faint net of brown moss lines around stony patches, with a glove in front, sloping to a beach and blue bay with a ship and snowy peaks. — Sorted Stones at Gåshamna Lutz Beckebanze

Video of a bright orange lava fountain shooting up from a dark volcanic cone, with lava trickling down its flank and grey fumes drifting across a barren lava field. — The red fountain of furnace mountain Martin Mergili

Bright lightning bolt striking down to distant hills from a dark storm cloud, with long branching channels spreading across the sky above dark fields and silhouetted trees. — Positive cg Michiel Baatsen

Wide tidal flat with rows of brown sand ripples between shallow pools of water reflecting a blue sky and white clouds, with a low line of land on the horizon. — Sand ripples Bing Yuan

Roadside cutting in layered red-brown and pale green sediments, where the layers drop down along a V-shaped notch of faulted blocks, behind a crash barrier and an empty road. — Normal Fault Babak Hejrani

Deep soil pit cut into dark grey, cracked clay soil with a red and white measuring rod, while two people in colourful clothes and one in a blue shirt pick cotton from plants at the edge above. — Black cotton soil in rural India Steffen Schweizer

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