Lava domes -- or volcanic domes -- vary in size and shape. They can reach up to 1,640 feet high, but typically stay within ranges of 30 to 320 feet, according to the USGS. They're also pretty common.

After tinkering with their model, they found the only conditions that led to the shape of the domes on Venus were that the lithosphere was somewhat bendy and the lava was dense.