Air-sign people are easy-going, fun-loving and naturally charming. They think, therefore they are. But the most common accusation, which comes by the air sign, is that it is superficial and doesn't believe in deeply forged relationships. The earth sign on the other hand, crave physical contact. Their life depends on touch and taste. They want to do things independently and on their own - a fact, which can be frustrating, because earth-sign people tend to move slowly. So basically, while the air sign is superficial and fun loving, the earth is slow moving, so the compatibility level is opposite in nature.