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Pale crystals project from a dark, metallic-looking mineral specimen on a light background.

A pale, coarse-grained rock surface stands in front of a pile of larger stones.

A winding paved road follows pale excavated rock faces in an overhead view.

Excavated rock faces and industrial buildings sit beyond fields and trees.

Repeating angled metal surfaces form a pattern of light grey planes and shadows.

Hands hold a digital caliper around a small metal part on a workbench.

A graduated pipette stands in a clear flask beside bottles and laboratory equipment.

Wooden beams sit beneath a loading fixture in a workshop-style testing area.

A binocular microscope stands on a light laboratory bench with equipment in the background.

Two clamped syringes are positioned above glass beakers on a laboratory bench.

Gloved hands hold a welding electrode over metal as a bright arc and smoke rise.

An industrial network of pipes, valves and cylindrical equipment fills a monochrome frame.

A machine-tool spindle and cutting head sit above a bright circular metal workpiece.

Large pipes, ducts, platforms and vertical industrial structures cross a building exterior.

A dark metal lathe with a handwheel and tool carriage stands beside a window.

Electrical equipment and overhead conductors stand behind a fence under a blue sky.

Ceramic-looking insulators and metal electrical connections stand against a clear blue sky.

Tall lattice transmission towers carry parallel power lines into a hazy distance.

A utility pole holds a transformer and crossing wires against a blue sky.

A utility pole and wires overlook a rocky, sparsely vegetated landscape in black and white.

Rows of tilted solar panels extend above red ground beneath large clouds.

Wind turbines stand across green agricultural fields in low sunlight.

Solar panels cover both slopes of a corrugated roof, viewed along its ridge.

Water flows beside a weathered hydroelectric building into a broad river.

Several wind turbines appear faintly through pale mist.

A mechanical grab lifts mixed metal scrap above an industrial yard.

A pile of irregular metal components includes brackets, housings and a round motor-like part.

Neatly stacked wooden pallets stand on a paved industrial yard.

Corroded pipe sections and a radiator lie among other discarded metal pieces.

An open rail wagon carries mixed metal scrap between parallel railway tracks.