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1675 items

Ground surface strewn with hundreds of small round, coin-shaped Nummulites fossils weathering out of grey sediment, with a rock hammer laid in the middle for scale. — Nummulites accumulations Mehdi Hadi

Koi with orange and white patches swimming in a clear pond over grey stone slabs, with green rippling water and reflections behind. — Fish swimming in a clear lake - from Crypto.ru Vlad Vlad Krylov

Grey rock surface crossed by winding dark burrow traces, each with two outer lines and a central tube, with a blue and yellow pen for scale. — Bioturbation, Oligocene?, coastal range of Taiwan. Guilhem Amin Douillet

Small tuft of dry plant on grey gravelly ground with a low tail of fine dark sand trailing behind it, and a black folding shovel lying nearby for scale. — A baby lee dune on ignimbrite surface Tobias Heckmann

Black-and-white view of a lone rounded iceberg with dark streaks of ash in its layers, floating on a calm lagoon, with a glacier and dark hills behind. — Standing alone and cold María Burguet

Orange-brown slug on grey asphalt at the end of a long, winding dark slime trail, with the tip of a hiking boot at the bottom edge. — Going slowly, but always going Mahshad Forghanifar

Several low semicircular walls of piled stones on a pale gravel shore, each open on one side, beside a lake of vivid turquoise water with a white salty edge and scattered tufts of yellow grass. — Meteorological Architecture Ana Maria Machedon

Video of a field of stratocumulus seen from above: tightly packed grey and white cloud heaps with darker gaps between them. — Stratocumulus field from above Konstantinos Kourtidis

Electron micrograph of large rounded spheres covered in tiny flaky crystals, crowded together on a surface strewn with many small rice-shaped grains. — Experimental quenched magma Thomas P. Ferrand

Snow blowing in low streaks across a flat, wind-sculpted white plain, with dark buildings and containers of a research station on the horizon against a low sun. — Antarctic Summer Breeze Kathrin Brocker

Turbulent green meltwater stream cutting through a deep channel in thick snow beside a glacier, dark boulders scattered on the white slopes under clouds and blue sky. — The icehouse planet "Hoth" is warming Eivind Straume

Close-up of a large, shiny dome-shaped mud bubble rising from a pool of grey mud ringed by concentric ripples. — Muddy volcano2, Buzau County, Romania Raluca-Mihaela Maftei

Grey rock outcrop of thin pale and dark layers bent into tight zigzag chevron folds across its whole surface. — Bordardoué Folding in Volcano-Sedimentary Sequence Louis-Alexandre Lobanov

Black-and-white close-up of a laboratory relief model: a fault line runs diagonally across a smooth surface, with feathery branching gullies cut into the raised side and a 2 cm scale bar. — Geomorphic analog experiment (Normal Fault) Stephane Dominguez

Grey mountainside of thin pale and dark rock layers bent into tight wavy folds and zigzags, with patches of green shrubs and a band of conifer trees along the bottom. — Plastic deformation Dario Zampieri

Confocal micrograph of grey soil fragments on a grey background, with bright magenta colour concentrated along the edges of the largest fragment, and a scale bar reading 100 um. — Nibbling round the edges Maria Hernandez-Soriano

Shallow water over sand, rippled with bright net-like patterns of sunlight, and in the middle a thin coiled sand casting curled into a heart shape. — From a lugworm with love Jenny Ullgren

Small round mud volcano pool filled with grey liquid mud in concentric rings around a bulging bubble, set in a crater of cracked, pale grey dried mud. — Azerbaijan, Kobustan area, Mud volcano (salse) Arzu Javadova

Grey volcanic crater floor strewn with rocks and yellowish patches, steam rising into thick fog, and small groups of people sitting and standing among the boulders. — Tangkuban Parahu Volcano Crater Gamma Abdul Jabbar

Aerial view of grey, steeply layered limestone mountains with a small white glacier patch on a ridge, partly wrapped in cloud. — Racing against time. The only glacier in the western Pacific Warm Pool, Papua, Indonesia. R. Dwi Susanto

Video of black sand with fine ripples, close to the ground, with low mounds topped by green grass and misty hills in the background. — Shifting Basaltic Sands Emma Rogers

Aerial view of a grey mountain valley with steep moraine ridges enclosing small turquoise pools and a lingering snow patch, with smooth grey bedrock in the foreground. — Disappearing glaciers Stefan Winkler

Black-and-white X-ray image of sea shells digitally mirrored into a repeating symmetrical pattern of grey ovals, dark curved outlines and fine streaks covering the whole frame. — Artificial mirror effect on radiographic image Dursun Acar

Vines growing in shallow hollows in black volcanic ash, each sheltered by a curved low wall of dark stones, with many more walled hollows across the slope and a person in the distance. — Cropped soils in La Geria Antonio Jordán

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