What do you find out?	Scientists gather evidence in the field to help answer these questions.
		We wrestle with all sorts of questions, such as: What was the early Earth like when it first formed 4.5 billion years ago? Why does the Earth look the way it does? How did the Earth become habitable for creatures like ourselves? How does the interior of the Earth work? What causes changes in the climate of the Earth? These are big, complicated questions. A scientist might spend his whole career trying to answer just one little tiny part of one of them.