A skull from an ancient human being has 146C decay rate of 4.0 counts per minute per gram of carbon. The decay rate of 146C in living organisms is 15.3 counts per minute per gram of carbon. Calculate the age of the skull. The half life of 146C is 5730 years.

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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Sorry  i don't understand can you rephrase that