The correct spelling of the phrase "wert horizon" is actually "wert izon". The "h" is silent and not pronounced. The word "izon" is derived from the French word "horizon", which means the boundary line between the earth and sky. However, in English, the "h" is not pronounced in many words that are originally French. Therefore, the correct pronunciation is "wurt aɪzɑːn". It is important to remember accurate spellings and pronunciations to ensure effective communication.