Longer essays may also contain an introductory page that defines words and phrases of the essay's topic. Most academic institutions require that all substantial facts, quotations, and other porting material in an essay be referenced in a bibliography or works cited page at the end of the text. This scholarly convention helps others (whether teachers or fellow scholars) to understand the basis of facts and quotations the author uses to support the essay's argument and helps readers evaluate to what extent the argument is supported by evidence, and to evaluate the quality of that evidence. The academic essay tests the student's ability to present their thoughts in an organized way and is designed to test their intellectual capabilities.
Earth history is much deeper, than one could imagine, and in order to analyze and really understand how the Earth evolved during millions of years, when humans were not existent on the planet, it is important to apply scientific knowledge and methods that would allow to see the past through the means and tools, not available for unarmed human eye. We should be extremely grateful to the Earth Science for the knowledge and experience we possess and acquired through the discovery and use of the historical facts and understanding of the path that our planet has undergone to be in the state it is now (Moller and Tasset 1967:123).