Q: You are presented with the quiz "What causes cloudy and rainy weather?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "awarm front causes cloudy and rainy weather" and "warm air moving into an area of cold air is called a warm front ". So, what's the best answer to the question?

Available choices: 1. Cold air forming fog. 2. a hemisphere is tilted away from the sun. 3. Warm air near the oceans. 4. Breathing too fast or too slow. 5. Cold winds near the mountains. 6. Warm air moving into cold air. 7. Earth's axis of rotation is tilted. 8. extreme heat and pressure.
The answer is:
6.