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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

Close-up of shelly phosphorite: elongated grey brachiopod shell fragments with fine wavy bands, set in a white crystalline cement, with clusters of dark grains on the right. — Shelly phosphorites from the Aseri deposit. Sophie Graul

Close-up of a polished rock surface with a curved cream and orange shell fragment, dark pores and rounded grains set in a mottled yellow, orange and white carbonate cement. — Iron-rich shelly phosphorite, Estonia Sophie Graul

Close-up of a long shell fragment striped in reddish brown, cream and dark lines, set among clear rounded quartz grains and pale yellow and olive banded material in a white cement. — Iron-rich shell fragment cemented by carbonate from the Kabala phosphorite deposit, Estonia Sophie Graul

Huge round sinkhole with steep pale layered rock walls and dark water at the bottom, set in a flat, dry grassy plain with power poles on the horizon. — Kızören Sinkhole, Konya Onur Cem Yoloğlu

Desert outcrop of tilted, pale orange sandstone beds dipping across a slope, overlain by darker rock layers above, with the sun glaring over the ridge and a dry shrub on the gravel in front. — Outcrop of angular unconformity in sandstone, in Saint Catherine, South Saini, Egypt Metwally Hamza

Rocky desert hillside under a blue sky with red lines drawn on it, separating pale brown blocky rock marked A from bands of dark grey crumbly rock marked B. — Contact between Ortho-gneiss and Para-gneiss Metwally Hamza

Pipe sticking out of a pale orange earthen bank pouring thick reddish-brown mud into a pond of the same muddy fluid, with swirling patterns on its surface. — Borehole Drilling Fluid Pond Metwally Hamza

Tree with a pale trunk that bends down to the ground in a wide arch before rising again into several leafy stems, on a sun-dappled dirt slope among other trees. — Dragon tree- time effect,Nature Siham Belhaj

Large reddish-brown rammed-earth palace with crenellated towers and arched windows, behind date palms under a heavy grey cloudy sky. — Tisrgate Palace-Zagoura,Morroco Siham Belhaj

Bare brown desert hills with faint curving layered bands and a winding track, under a wide sky of white and grey clouds. — Dades Valley-Morroco Siham Belhaj

Stepped rows of wire mesh cages filled with dark stones laid along a sandy beach, with concrete houses, a few people and the sea in the background. — Climate change and costal Erosion in Saint Louis, Senegal Djiby Sambou

Cross-polarised micrograph of a foraminifer shell: vivid bands of pink, orange, green and blue crystals curving across a speckled grey matrix with small dark bubbles. — Psychedelic Foraminifera Charlotte Beasley

Grey overcast sky whose cloud base is rippled into rolling waves like a rough sea seen from below, above the dark silhouette of a wooded hillside. — Altocumulus asperitas Claudine Vanbauce

Thin white aircraft contrail with a row of small hanging tufts like a barcode, crossing a pale blue sky streaked with wispy cirrus cloud. — Barcodus, a new cloud :) Claudine Vanbauce

Dark brown hardened band of soil, crusted and rusty, running across an orange-brown sandy soil face, with a small pocket knife pushed into the soil above for scale. — Iron pan 120 cm below the soil surface Antonio Jordán

Field of raised beds covered with black plastic film and weeds, with a group of people at the far end pulling up the film, next to a wire fence and pine trees. — Workers retiring plastic film after harvest in El Cebollar experimental farm Antonio Jordán

Bright sun low over a flat ocean horizon in a golden hazy sky, casting a glittering path of light across the dark rippled water. — Sunset over the Atlantic Ocean in Sines (Portugal) Antonio Jordán

Seen from above, about eight dark grey spiny-tailed iguanas with yellowish patches and banded tails, sprawled over one another on a pale rock and sandy ground. — Don't touch our rock! Antonio Jordán

Aerial view of a long curving coastline where tan reed marshes and blue pools meet a pale sandy beach and the blue sea. — Beautiful images from Danube Delta Maria Krommyda

Wide green wetland plain laced with streams and dotted with grazing llamas, below a lone snow-capped volcanic cone and brown hills, seen from a dry slope with tufts of grass. — Century-old living oasis Manon Bounous

Aerial view of a long wooden boat with an outboard motor moored at a sandy riverbank, three people bathing in the brown water and one standing on the bank. — After work time! Fernando Leceta Gobitz

Large Gothic church of pale stone with tall arched windows, pinnacles and a square tower, seen past a stone balustrade under a blue sky, with a town building on the right. — Chapel Aslı Karabayır

Rectangular pool of still green water surrounded by stone columns, a terrace with statues and burning torches, with a few people walking around the edge. — Roman Bath Aslı Karabayır

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