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Oval rock sample on a grey background, with an orange rim enclosing milky white and translucent calcite crystals and a small cavity of rounded crystals. — Calcite Crystals from Egypt’s Eastern Desert Ahmed-M- Mohy

Close-up of a grey-brown soil face with fine horizontal layers and faint rusty mottles, beneath a crumbly, lumpy pale grey layer at the top. — Detail of redox features Antonio Jordán

Looking down at a person's bare feet and lower legs thickly caked in brown mud, standing on dry cracked earth. — When the 2 by 5 is the only way to access the mangroves Peter Gitau

Bare mountains of tilted grey, brown and rusty layered rock with patches of snow, rising behind a wide flat plain of grey gravel under a pale blue sky. — The beauty of an Arctic rock desert Sandrine Ritter

Deep gully cutting through curved, finely layered grey and dark pyroclastic deposits, with the bands sweeping around its walls, green shrubs above and gravel in front. — Deposits of the tuff ring on Shiveluch volcano Boris Gordeychik

Dry riverbed of pale mud cracked into curled polygonal plates, stretching towards low banks with shrubs under a pastel evening sky. — Shrinking Wadi Sediments Vincent Felde

Arid plain of pale stony ground dotted with small dry shrubs, rising to a dark, bare mountain with layered slopes under a blue sky with one white cloud. — Desert landscape in the Canary Islands Antonio Jordán

Grey ash track with tyre ruts running across a flat grey surface patched with green grass, lined by tall grasses under a hazy white sky. — Fly ash pond Kripal Singh

Wide flat sandy beach covered in rows of small ridges and pits all running towards the horizon, with two elongated shells in the foreground and dunes in the distance under a dark sky. — Erosion Patterns at Beach Joern Behrens

Video of two king penguins with flippers spread walking side by side across a grey sandy beach towards a huge dense colony of penguins in the background. — King penguins taking off? Etienne Pauthenet

Wet grey mud cracked into small lumpy polygons with white crusts, separated by brown water, with tufts of dry grass. Caption reads Cracked geothermal muddy soil. — Cracked geothermal soil Hugo Beraldi

Rough salt flat of broken grey-brown salt slabs stretching to the horizon, where a long line of camels and a few people walk past in front of a hazy mountain. — Salt flat in the Danakil depression Dario Zampieri

Aerial view of grey volcanic plain cut by long parallel cracks and a small sunken strip between faults, the shadow of a helicopter on the ground and a white plume rising from red lava far behind. — Faulting above a dyke intrusion Morgan Jones

Clear shallow water over a sandy bottom seen from above, rippled light patterns on the sand and a wavy line where a small wave front meets the sand. — S(tr)anding – Sand, waves and sunlight Veera Haapaniemi

View from above over a barren pale brown landscape of low rounded hills cut by branching gullies with steep crumbling walls. — Gully Ali Mohammadian Behbahani

Close-up of a pale grey, crackled mudstone slope with a brown fossil bone lying horizontally in it, beside a thin line of reddish pebbles. — Dinosaur bone in a hoodoo Matthew Herod

Rounded hills of layered sedimentary rock in red, pink, cream and yellow-green bands at the foot of a steep, gullied brown mountain range, with a dusty track and sparse scrub in front. — Danxia landform Xueyi Xun

Close-up of a grey-brown rock block full of elongated holes and flattened cavities aligned in the same tilted direction, with a yellow notebook and pen for scale. — Imbrication of pumices in an ignimbrite Anita Di Chiara

Wide pale grey and orange mineral flat with a line of people walking along a boardwalk in the distance, in front of rising steam and a forested hill. — Where People meet Earth, Yellowstone National Park Alexandra Cosseron

Close-up of white and pale grey travertine surface covered in tiny rimmed terraces and wavy ridges, with faint pink-brown staining, like the lines of a fingerprint. — Fingerprint in the cotton Petra Schneider

Close-up of a pale rock face packed with large translucent grey and white blade-shaped crystals in fan-like clusters, with a gold-coloured coin for scale. — Outcrop of Calcite/Gypsum Full-growth Crystals Metwally Hamza

Rugged outcrop of pinkish granite with grey weathered patches and cracks, with a blue-handled geological hammer resting in a crevice for scale. — The outcrop of G3-granite Metwally Hamza

Natural bust? Stefan Winkler

Person in a red shirt standing among thin dark-trunked trees on a bare dusty slope with almost no undergrowth, scattered dry leaves and small sticks. — Kukrail Degraded forest Kripal Singh

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