Habits are great labor savors. Once we learn to do something, it takes less attention and effort to do it again, so we can satisfy the fire urge to break new ground. I'll try it and find out. Earth is basically practical. Do it and see.
Air is basically logical, creating abstract conceptual systems, maps and models of ideas.
Of course, what is considered logical depends on one's premises, so unless these are initially grounded in the practical earth, we can create castles in the air. Earth and water want to protect, so they are normally more serious. Earth may save for practical reasons, because something could be useful. Water wants emotional security. This may simply be personal security or may include others.