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Clay

Close-up through a lens of a small orange-brown soil crumb held by tweezers, its surface glossed with shiny brown clay coatings, against a pale backlit circle. — Clay coatings on pore surfaces of a soil aggregate from an illuvial horizon of a luvisol Vincent Felde

Tall graduated cylinder on a black laboratory bench, filled with brown cloudy liquid that is darker towards the bottom, with a wash bottle and taps behind. — Sand falls and clay waits Antonio Jordán

Large rounded hill of pale orange layered rock rising from a desert slope, with many people climbing it and walking towards it, some standing on the summit. — Gabal Al-Modawara – A Natural Sedimentary Record on the Edge of the Fayoum Depression Ahmed-M- Mohy

Smiling child holding up both hands stained bright orange-red with clay, with smears of it on one cheek, in front of a blurred green and red-earth background. — A mini-experiment by a mini-scientist Antonio Jordán

Person with a backpack standing on a red earth path between two tall, narrow grey limestone pillars, with trees and a cloudy sky behind. — Blood and stone giants Antonio Jordán

Brown soil aggregate with smooth clayey films on its surfaces and a small round pore near the top, lying on a white card with a millimetre ruler and a centimetre scale bar. — Soil aggregate from a salic horizon showing clayey coating films and a macropore Antonio Jordán

Calcic Luvisol (near Sevilla, SW Spain) Antonio Jordán

Low view across a field of cracked grey clay soil with scattered dry crop stubble, slightly raised and hollowed ground, and green weeds growing behind, under a blue sky. — Microrelief of a Vertisol showing weak gilgai features Antonio Jordán

Calcic Luvisol (Sevilla, SW Spain) Antonio Jordán

Calcic Luvisol (Sevilla, SW Spain) Antonio Jordán

Close-up of grey grassy soil split by deep, wide cracks into blocky slabs, with a red lighter lying alongside for scale. — Cracks get you goin' (soil cracks in a vertisol) Antonio Jordán

Flat, fallow field of dark soil with patchy green weeds stretching to a level horizon under a pale blue sky with a few small clouds. — On the black land, under the blue sky Antonio Jordán

Low tide beach of wet sand with grey clay and silt exposed in rows of small scalloped cusps and ridges, with a few seabirds standing near the water's edge. — Mud cusps at Cap Blanc-Nez Franziska Staudt

Diagram of a soil texture triangle in Spanish, coloured fields for clay, silt and sand classes, with yellow dashed lines showing how to read off a sample at 50 percent clay. — Soil texture triangle (in Spanish) Antonio Jordán

Narrow, steep-sided wall of pale grey clay snaking across a green valley like a crest, with eroded slopes, yellow flowering shrubs and a small house on the far ridge. — Once there was a road...the clay wall Chiara Arrighi

Valley of steep, deeply gullied slopes of pale cream clay, with green vegetation and yellow flowering shrubs on the ridges, and hazy blue hills on the horizon. — Hiking in the badlands (Calanchi) Chiara Arrighi

Close-up of three small flaky mineral pieces of vermiculite, dark and glassy with golden-brown edges, resting in the palm of a hand. — Small pieces of vermiculite Antonio Jordán

Chart of area to volume ratio against particle diameter: a curve plunging from very high values for clay and silt to near zero across the sand range, with the sphere formulas. — Specific surface of soil mineral particles Antonio Jordán

Hand holding a small lump of reddish-brown soil with a short hollow tube of clay sticking out of its top, in front of blurred green grass and bare red soil in mist. — Clay building in a soil aggregate Antonio Jordán

Flat featureless plain of pale grey soil broken into small dry crusted clods and cracked plates, stretching to the horizon under a clear blue sky. — Endosodic Solonchack (Doñana National Park, SW Spain) Antonio Jordán

Tall quarry wall in layered volcanic deposits: ochre and grey bands above deep red and dark grey slopes, with a green bush and grass in front and a green date stamp in the corner. — Colors of Racos Vitalie Petra

Hand holding an angular block of red clayey soil with flat faces and sharp edges, flecked with small pale grains and with a smooth grey pebble set in its base. — Blocky aggregate from a red clayey soil Antonio Jordán

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