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False-colour micrograph of a coesite grain: a rounded blue patch with a green area and a few white specks, set in a speckled red surrounding mineral.
Coesite Franziska Wilke
Full moon high in a cloudy blue evening sky above a dark red desert plain, with a flat-topped red sandstone butte and distant mesas along the horizon.
Moonrise over Monument Valley, Arizona Ioannis Daglis
Pale shaft of light filled with drifting dust falling vertically through a narrow canyon of smooth, curving dark red sandstone walls.
Antelope Canyon Ioannis Daglis
Three grey bottlenose dolphins surfacing together in blue rippled sea, their dorsal fins and heads above the water, with a copyright watermark along the bottom.
Bottlenose dolphins Archipelagos - Institute of Marine Conservation
Electron micrograph of a round soot particle with a rough surface of tiny flaky crystals and a small crater near the top, with a scale bar of about 20 µm.
SEM image of a soot aerosol particle. Konstantinos Kourtidis
Electron micrograph of cement clinker: a dense jumble of needle-shaped and plate-like crystals with small rounded grains, with a scale bar of about 20 µm.
SEM image of cement clinker Konstantinos Kourtidis
Electron micrograph of a lumpy soot aggregate made of rough rounded particles clumped together, with a scale bar of about 100 µm.
Soot particle Konstantinos Kourtidis
Black-and-white electron micrograph of a crowded mass of rounded and irregular aerosol particles, with a scale bar labelled about 20 micrometres.
SEM image of aerosol particles near a cement plant Konstantinos Kourtidis

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