Please explain and answer Cold front Only front that does not intersect the Earth's surface Where moist and dry air meet Homogenous in temperature

Please explain and answer

Cold front

1. Only front that does not intersect the Earth's surface
2. Where moist and dry air meet
3. Homogenous in temperature and humidity at the same elevation
4. Where cold air displaces warm air
5. Where warm air overrides retreating cold air