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Redox

Person in a blue jacket crouches on a wet grassy field to photograph a small hole dug in the soil with a phone, a pickaxe and a white bag lying nearby, a puddle behind. — Soil colors written by water Antonio Jordán

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

Soil aggregate showing redoximorphic features Antonio Jordán

Soil aggregate showing redoximorphic features Antonio Jordán

Six rock and soil fragments mottled rusty red, orange and pale grey, laid out in a loose ring on grey sandy ground with pine needles. — Iron veins and soil stains Antonio Jordán

Close-up of a grey-brown soil face with fine horizontal layers and faint rusty mottles, beneath a crumbly, lumpy pale grey layer at the top. — Detail of redox features Antonio Jordán

Close-up of cracked bright red soil with dark spots and a pale yellowish band along a crack, with a cigarette lighter placed for scale. — Soil colours indicate different processes Antonio Jordán

Close-up of a soil face mottled in brick red, orange and greyish green, scattered with small rounded pale pebbles in the upper part. — Redox processes Antonio Jordán

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