Adecrease in the density of a sample of a gas inside a balloon could be caused by a) putting the balloon in the refrigerator. b) taking the balloon outside on a hot day. c) shaping the balloon into the shape of a dog. d) taking the balloon down to the bottom of the ocean.

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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