When many men in the baby boomer segment started getting gray hair, they were reluctant to use hair dyes made for women even though they were just as eager as women to fight the aging process. To address this reluctance, hair care product manufacturers introduced hair dying systems for men to use on their head and their facial hair. The hair care product manufacturers used segmentation to define their target markets.

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.

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