They have hot tempers. There are people who make ideas catch fire and spring into existence. Earth signs are the builders of the zodiac who follow through after the initiative of fire signs to make things happen. These people are solid, practical realists who enjoy material things and sensual pleasures. They are interested in ideas that can be used to achieve concrete results.
Air signs are mental people, great communicators.
Following the consolidating earth signs, they'll reach out to inspire others through the use of words, social contacts, discussion and debate. Water signs complete each four-sign series, adding the ingredients of emotion, compassion and imagination. The second consideration when defining a sign is how it will operate. These people love to be active and involved in projects. They are usually on the fast track to success, impatient to get things under way.