To dream of the earth represents your feelings or perception of your entire life at the current moment. A situation that you are totally immersed right now. The dominating theme or purpose of your life.
Alternatively, dreaming of the may reflect feeling that your whole life or future is on the line. Something bigger than you is on your mind.
To dream of the passing under rainbows, doorways, or bridges may reflect you entire life undergoing a powerful transformation.
Example: A woman dreamed of seeing her belly as a globe of that ended up in a blaze of fire. In waking life she was heavily pregnant and was enjoying it so much that she didn’t like the feeling of not being pregnant after giving birth. The globe of the earth may have reflected her feelings about her entire life revolving about enjoying being pregnant.