14.2.1 Background properties: 'background-color', 'background-image', 'background-repeat', 'background-attachment', 'background-position', and 'background'. This property sets the background color of an element, either a <color> value or the keyword 'transparent', to make the underlying colors shine through.
1 A spiral fracture happens when the break spirals around the bone, which can happen if the bone is twisted. 2  A compression fracture happens when vertebrae in the spinal column are pushed together in an accident or because of osteoporosis.
Some, known more precisely as âbarred spirals,â have a bar structure in their center, formed by dust and gas funneled into the center. Present in all spirals, the dust and gas fuel star formation, so spiral galaxies are constantly forming stars today. Elliptical galaxies lack the spiral arms of their more flamboyant cousins. Their appearance ranges from extremely circular to very stretched out.