Dos trozos de carbón bituminoso para generar energía aislada en negro . - Foto e imágenes de stock

Coal on a black background

Natural wood charcoal collage

Two chunks of bituminous coal use to generate power isolated on black.

Two chunks of bituminous carbon use to generate power isolated on white

A conceptual image of an extension cord plugged intop a chunk of bituminous coal isolated on black.

Chunk of coal with en extension cord plugged into it.

A gold nugget isolated on a white background

Ropey lava is a result of the front flow slowing down and the back flow speeding up, causing the lava to roll over itself and forming rope shapes.

A bowl of shelled sunflower seeds isolated on a white background.

Close up of a rock striation on the side of a mountain.