Plz hurry it's urgent! which describes a process where a precipitate is formed? a. a solution of agno3 is added to a solution of cacl2 to produce solid agcl and a solution of cano3. b. propane gas combusts to form co2 and h2o. c. a solution of hcl mixes with a solution of ca(oh)2 to produce h2o and cacl2. d. a solution of h2so4 mixes with a solution of naoh to produce water and na2so4.

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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