Fire, earth, air, and water.

THE ARIES, LEO AND SAGITTARIUS ARE FIRE SIGNS

The fire signs are like fire; they are warm-blooded. They are burning. As a result, they have a fiery temperament. They have a lot of zest for life and self-confidence. But just like fire, they can also be highly flammable and flare up high, but also quickly continue to glow like a low smoldering fire.

Like flames going up and down in a fire. Fire needs air. A combination of fire and air strengthens the fire sign, but burns the air away.

THE TAURUS, VIRGO AND CAPRICORN ARE EARTH SIGNS

Earth signs are like a field which, if properly tilled, yields a rich harvest in the form of wealth. However, if the approach becomes too material, it produces sterility.

Earth types are earthy, solid and powerful types. Steadfast in their attitude. Sometimes unyielding, as earth can be.

THE AQUARIUS, GEMINI AND LIBRA ARE AIR SIGNS

The Air signs are all light and nimble. They are active, lively and quick-witted. They enjoy connecting facts and data. The emphasis is on abstract thinking, theorizing and working with ideas. They can be innovators of thought. They are often good analytical thinkers. They speak easily and are convincing.

PISCES, CANCER AND SCORPIO ARE WATER SIGNS

Water signs are all sensitive people. They all express it very differently. The Cancer crawls into his shell and can mope in a corner. The Scorpio is just as sensitive but hits back hard as a reaction and as his weapon, but a nasty comment hits him just as hard as it does a Cancer or the Pisces. Pisces respond to their sensitivity by talking a lot and shout out their emotions.
Water types are emotional and sensitive. This gives them the ability to empathize with others.
Water signs adapt to the environment in the same way that water adapts to the capriciousness of the shape in which they sit.