The zodiac circle has twelve signs beginning with Aries and concluding with Pisces. Each sign has traits that set it apart from the others These twelve signs are covered by four elements, fire, earth, air and water.
The element of fire is associated with the signs of Aries, Leo and Sagittarius. People born under this sign are fiery, but they are also very creative, energetic, and are often larger than life. They have great ideas, but often do not follow them through. On the dark side they can be bossy and domineering, egotistical and selfish.
The element of earth is associated with the signs of Taurus, Virgo and Capricorn.. People born under this elements are very down to earth and dependable. They are practical, tend to be conservative, as they dislike risks. They are the planners and builders of the zodiac. They are often very materialistic, and this can manifest iteself in greed. They are very reliable, and you can be sure that they will be there for you, when you most need someone. They love fine food and drinks. Despite the fact that they have their feet on the ground, they can overlook the feelings of others, the end result is often more important, than how they play the game.
The element of air is associated with Gemini, Libra and Aquarius. They are the intellectuals of the zodiac, they are capable of great powers of reasoning. They love to probe and think, and work out new solutions. They have a natural curiosity, that allows them to work on the big picture, and analyse, but balance is important to them.They really are out to change the world, they are natural humanitarians. They can blow an icy draught if you upset them, but in general they are optimistic and very fair.
The element of water is associated with the Signs Cancer, Scorpio and Pisces. As the element suggests it is fluid, and they do run deep.They are deeply intuitive, and nurture, but their actions are very much rooted in common sense. These terms can easily apply to an individual's emotions, which are exactly the realm in which Water exerts its influence. They are artisitic, and revere beauty, and are very helpful. The dark side is that they are brooders, because they think so deeply and they can suffer from mood swings.
More on the Elements of Zodiac Compatibility - http://www.birthday-horoscopes.net/zodiac-compatibility.htm