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Close-up of a white limestone block scattered with small rounded tan and orange fossil grains, with a laptop screen blurred in the background. — Microscopic Fossils Preserved within Limestone from El-Ghanayem, Assiut, Egypt Ahmed-M- Mohy

Wide, deep blue lake stretching to brown hills, with a row of snow-covered peaks and white clouds beneath a bright blue sky. — Pumo Yumco — The Sapphire Among the Himalayas Ping Zhao

Jets of steaming hot water spraying out of a dark, mineral-stained cliff face, a faint rainbow in the mist, with colourful prayer flags strung above. — Janggu Lungba hot spring on a steep cliffside, in Xizang (Tibet) Ping Zhao

Terraced rock of bright green and brown travertine with rippled rims and small pools, beside a fast, foaming turquoise river between pale rock banks. — Quse hot spring, surrounded by green travertine, in Xizang (Tibet) Ping Zhao

Jet of hot water shooting into the air and falling into a shallow pool rimmed by orange and green mineral deposits on a pebbly river beach, pylons in the distance. — Luozha Hot Spring, Namling County, in Xizang (Tibet) Ping Zhao

Several jets of hot water spurting from mounds of orange and brown mineral deposits, with steam drifting across a hillside under a blue sky. — Darong Hot Spring, Zhongba County, in Xizang (Tibet) Ping Zhao

Silhouetted high-rise towers on the far shore of a calm river at sunset under an orange and purple sky, with moored sailing boats and covered pedal boats in the foreground. — Donaustadt Highrises Jakub Stepanovic

Close-up of a gneiss with shiny black mica flakes in streaks, white and cream feldspar grains, pale gold metallic patches and silvery graphite flakes. — Sulphide and graphite-rich gneiss Sophie Graul

Close-up of white translucent calcite crystals forming a vein through marble, scattered with brown mica flakes and grey metallic grains. — Calcite vein associated with biotite and pyrrhotite in Svecofennian marble, Precambrian basement of Estonia Sophie Graul

Two polished rock slabs, each showing a dark black band next to an olive-green granular zone grading into white crystalline marble with dark grains. — Contact aureole between tonalitic melt and diopside marble, Precambrian basement of Estonia Sophie Graul

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

Close-up of a pale silvery metallic patch filling a crack among dense, spiky black flakes of mica and graphite in a dark rock. — Deformed pyrrhotite associated with graphite in Estonian Precambrian gneisses Sophie Graul

Tall, thin waterfall pouring down a rock face into a turquoise pool among large boulders, with a pebbly path in front and conifer forest beside it. — Hiking trail at Pericniku hut, Triglav National Park Szilvia Szilagyi

Clear turquoise river curving between white gravel banks, seen through bare trees from a woodland path, with forested mountains and a blue sky behind. — Sava river at Bohinjska Bela Szilvia Szilagyi

Sandstone face in cream, orange and pink with many thin sloping layers cut by flatter bedding surfaces, a pen standing vertically in the middle for scale. — Cross-bedded sandstone of the Taref Formation, Western Desert, Egypt Ahmed-M- Mohy

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

Two small white mushrooms with slender stems growing from the top of a moss-covered stump, in a blurred forest of fallen branches and mossy logs. — Mycena pura var. alba in a Bavarian Woodland Habitat Mahshad Forghanifar

View from behind the shaggy brown head and long curved horns of a resting cow, looking towards a grey cow grazing on a meadow by a lake, with a wind turbine on the far shore. — World from the eyes of Cow Mahshad Forghanifar

Panorama of a barren volcanic highland with a green moss-covered crater cone, rugged lava fields, a gravel road with a car and distant mountains under a blue sky. — Iceland's Volcanic Highlands Simona Cavallo

Thin-section micrograph under crossed polarisers of a large pyroxene crystal split into orange, bright blue and white twin bands, in a dark speckled groundmass. — Clinopyroxene in tephrite David Günzler

Thin-section micrograph under crossed polarisers of a cluster of pyroxene crystals in vivid yellow, purple, blue and orange, set in a dark speckled groundmass. — Clinopyroxene accumulate David Günzler

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

Video of a rocky hillside path with dark boulders and patches of low green plants, overlooking a fjord packed with jumbled white ice under a hazy blue sky. — Hike around Ilulissat fjord - UNESCO Heritage Adam Ciesielski

Pale, fractured white quartz vein cutting through a large grey striped boulder among loose rocks and a small stone cairn, below dark cliffs and glacier ice half hidden in cloud. — Geology: Rocky Glacier Valentin Schalk

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