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Clay

A rock fragment is held by tweezers against a gradient background. — Clay coatings on pore surfaces of a soil aggregate from an illuvial horizon of a luvisol Vincent Felde

A laboratory setup featuring a graduated cylinder with brown liquid and connected tubes. — Sand falls and clay waits Antonio Jordán

Tourists explore the sandy slopes of a massive rock formation under a clear blue sky. — Gabal Al-Modawara – A Natural Sedimentary Record on the Edge of the Fayoum Depression Ahmed-M- Mohy

A girl with muddy hands smiles outdoors, showing colorful bracelets and a "MOVE ON" shirt. — A mini-experiment by a mini-scientist Antonio Jordán

Person walking on a dirt path surrounded by tall rock formations under a cloudy sky. — Blood and stone giants Antonio Jordán

Rock sample with ruler scale and color legend, labeled by SECS, Sociedad Española de la Ciencia del Suelo. — Soil aggregate from a salic horizon showing clayey coating films and a macropore Antonio Jordán

Calcic Luvisol (near Sevilla, SW Spain) Antonio Jordán

Dry soil with scattered green plants and straw, under a clear blue sky. — Microrelief of a Vertisol showing weak gilgai features Antonio Jordán

Calcic Luvisol (Sevilla, SW Spain) Antonio Jordán

A trench reveals layered earth with a white brick wall and a blue-handled tool. — Calcic Luvisol (Sevilla, SW Spain) Antonio Jordán

"Red lighter resting on rocks with grass growing through." — Cracks get you goin' (soil cracks in a vertisol) Antonio Jordán

Vast open field with sparse vegetation under a clear blue sky. — On the black land, under the blue sky Antonio Jordán

Golden sand dunes meet shallow waters in a serene, expansive desert landscape. — Mud cusps at Cap Blanc-Nez Franziska Staudt

Color-coded soil texture triangle diagram showing percentages of sand, silt, and clay. — Soil texture triangle (in Spanish) Antonio Jordán

Cliffs overlook lush green hills with scattered yellow blooms and a distant building. — Once there was a road...the clay wall Chiara Arrighi

Lush green hills and yellow cliffs contrast against a distant mountain range. — Hiking in the badlands (Calanchi) Chiara Arrighi

Hand holding three rough, colorful rocks with black, green, and orange hues. — Small pieces of vermiculite Antonio Jordán

Graph showing specific surface of soil mineral particles (clay, silt, sand) vs. diameter. — Specific surface of soil mineral particles Antonio Jordán

Hand holding a small, weathered rock with a hole, set against a blurry outdoor background. — Clay building in a soil aggregate Antonio Jordán

Vast cracked desert extends endlessly under a clear blue sky. — Endosodic Solonchack (Doñana National Park, SW Spain) Antonio Jordán

Layered cliffs with vibrant earth tones and sparse vegetation under a clear blue sky. — Colors of Racos Vitalie Petra

Hand holds a reddish-brown rock fragment against a blurred dirt background. — Blocky aggregate from a red clayey soil Antonio Jordán

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