I What is Historical Geology? 定义对象-内容简史 Characterize Characterize Characterize 4大圈层,3个层次 Understand Understand Understand istorical geology is the study of the Predict Predict origin and evolution of Earth. Geologists are interested not only in placing events in 1998-2002 2003-2010 2010 and beyond a chronological sequence but, more impor- tantly, in explaining how and why past events took place. Recently, historical geol ogy has taken on even greater importance Air Water because scientists in many disciplines are Looking to the past to help explain current events(such as short- and long-term cli- matic changes) and using this information Land Life try and predict future trends1 What is Historical Geology? 定义-对象-内容-简史 4大圈层，3个层次