Completar frases Complete the spacesVersión en línea Completar espacios en blanco por marisa degenova 1 and rain with fuels of 1 - Burning of . 2 - Production of chemicals 3 - Reaction of polluting gases water in clouds . 4 - Formation sulphuric nitric acids . 5 - The falls as acid rain . 6 - Damage to the environment .