28. Use the following terms to create a concept map: ozone layer, ultraviolet (UV) light,
chlorofluorocarbons, polar vortex, polar
stratospheric clouds, and ozone hole.

meteorologists would compare a new weather map with one 24 h old to see how fast a front is moving.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%