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Cluster of long translucent cream and pale brown crystals radiating upwards from a crusty base, on a white surface with a coin below for scale.
M. Hamza's Geological Samples Collection: sample of calcite crystals Metwally Hamza
Hand specimen of orthoclase, a pale beige and cream rock with faint banding and a smooth cleavage face, lying on a white surface next to a gold-coloured coin for scale.
Orthoclase (KAlSi3O8) Metwally Hamza
Hand specimen of kaolinite, a chalky white lump with rough, flaky surfaces, lying on a white surface above a gold-coloured coin for scale.
Kaolinite (Al2Si2O5(OH)4) Metwally Hamza
Cut slab of conglomerate with rounded cream and tan pebbles packed in a reddish-brown gritty matrix, several pebbles outlined in blue marker, with a gold-coloured coin below for scale.
Ortho-Conglomerate (Sedimentary Clastic Rock) Metwally Hamza
Top view of a large circular tank lit by green laser light, showing swirling eddies traced in the water, with a dark camera mount and support rods in the centre.
The turbulent life of oceanic dense currents Maria Eletta Negretti
Pale blue chunks of ice in fast-flowing water, with white foam and smooth, mirror-like ripples reflecting a soft pink and grey twilight sky.
The Icy Laminar Mirror Kelvin, Tsz Hei Choi
Wooden boardwalks winding around a steaming crater with a milky pale blue pool in reddish-brown ground, a few people walking on them, and a dark lava field beyond.
On the Edge of Lava Field Kelvin, Tsz Hei Choi
Tall white column of steam and water shooting up from a geyser into a blue sky, towering over the flat land, with tiny silhouettes of people at its base.
Playing Hide and Seek with Geyser Kelvin, Tsz Hei Choi
Pile of large rounded tan granite boulders stacked up a hillside, with a thin slab leaning against them and a small tree at the top, set on a white background.
Rocking Skyline born in the U.S.A David Fernández-Blanco
Overhanging edge of a blue-white iceberg with thin streams of water dripping from its underside into calm blue sea, sparkling where they hit the surface.
Greenland ice sheets are melting Luisa Poto

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