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What covers most of the plains on Venus?

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Venus — Venus Venus photographed in ultraviolet light by the Pioneer Venus Orbiter (Pioneer 12) spacecraft, February 26, 1979. Although Venus's cloud cover is nearly featureless in visible light, ultraviolet imaging reveals distinctive structure and pattern, including global-scale V-shaped bands that open toward the west (left). Added color in the image emulates Venus's yellow-white appearance to the eye.

Most of the rolling plains on Venus are covered by huge lava fields. These extensive fields consist of overlapping lava flows that are generally long and thin, suggesting they were formed by highly fluid basaltic lavas.1