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5223 items

Aerial view of pale, hazy desert sand covered in rows of small wavy dunes, with a few faint dark patches scattered across the surface. — Dunes Konstantinos Kourtidis

Two offshore oil platforms linked by a bridge, silhouetted in grey haze above a glinting sea, with a small flare burning on a tall tower and cranes on the right platform. — Oil platform Konstantinos Kourtidis

Single slender tree, faint and grey, standing on flat ground in dense fog that hides everything else. — Tree in fog Radovan Tyl

Black-and-white electron micrograph of a single calcite crystal shaped like an imperfect cube, each of its three visible faces pitted with a rough, fringed hollow. — Wannabe cubic calcite Joanna Dziadkowiec

Micrograph of a microfossil: a single folded translucent brown sphere with dark crease lines, among dark debris clumps and tiny transparent square crystals. — Leiosphaeridia crassa Kabamba Baludikay

Cream and orange gypsum specimen made of many small clustered crystals, lying on a plain white surface and casting a shadow. — Gypsum Mineral Sample Ahmed-M- Mohy

Double rainbow arching across a dark grey sky, a bright primary bow below a faint secondary bow, with the darker Alexander's band between them, above trees, white houses and a power line. — Double rainbow with Alexander's band Konstantinos Kourtidis

Satellite image of a desert village whose dark patchwork of fields forms the crown of a tree, with a dry river channel as its trunk crossing a ridge and fanning out below like roots. — Satellite image of the tree-like village Mohammad Goudarzi

Black-and-white view of a sky filled with regular rows of rippled clouds, above the silhouettes of a tall poplar and a church spire. — Ondas de Nuvem no Céu Pablo Saavedra Garfias

Five people in bright outdoor clothing and backpacks walking in a line across snow-covered ground into thick grey fog, with the dark sea faintly visible at left. — Siberian High Arctic - looking for outcrops Dieter Franke

Snow-covered mountain peak poking out of a vast flat sea of white fog under a pale blue sky, like an iceberg in water. — The lonely sentinel Alessandro Lechmann

Large flat-topped iceberg with steep blue-white walls floating on a calm grey sea, with a few small ice chunks beside it under a hazy sky. — Icy landscape of the Baffin Bay Mechthild Doll

Black-and-white single colour band version of a rainbow arc across a grey sky, showing a bright main band with two or three faint, narrower parallel bands along its inner edge. — Supernumerary rainbows Konstantinos Kourtidis

Close-up of many water droplets of different sizes scattered across a grey glass pane, some round and some elongated, on a soft grey background. — Raindrops on a window Chaimae Beddad

Faint narrow-toed dinosaur footprint on a weathered grey and rust-coloured sandstone surface, with a white folding ruler opened at a right angle above it for scale. — Dinosaur footprint Gunnar Ries

Red bus on huge wheels crossing a flat snowy ice plain, with a band of ice and distant green buildings stretched and distorted by a mirage, below snow-covered mountains. — Fata Morgana Antarctica Reed Scherer

Dry marsh floor of pale grey cracked mud flakes stretching to a line of dark green pine trees and a sand dune under a blue sky, with two small dark clumps on the surface. — Dry salt marsh in Doñana (Doñana National Park, SW Spain) Antonio Jordán

Dry pale mud surface broken into large flat polygonal plates by deep cracks, with smaller plates in one corner and a pair of black sunglasses lying on one plate for scale. — Mud Cracks Outcrop in Arid Area, Red Sea Coast, Egypt Metwally Hamza

Video of white clouds and blue sky reflected in a thin layer of water over a flat salt surface, with faint polygonal salt ridges visible beneath the reflection. — Reflection in the Salar de Uyuni Fabien Darrouzet

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 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

Two thin white mineral veins crossing in an X on a flat grey rock surface, seen from above, with a walking boot and trouser leg at the bottom and a tuft of dry grass at the side. — Calcite vein interactions Max Arndt

Close-up of white ice full of tiny trapped bubbles and intricate overlapping plate-like crystals, giving a lacy pattern below the surface. — Ice patterns 2 from Rocky Mountain National Park Ellen Wohl

Aerial view of a glacier surface of white ridges and troughs, with dark and turquoise meltwater streams winding sideways along the hollows in deep channels. — Contorted Streams on the Gates Glacier Allen Pope

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