The PhD is a doctoral degree, specifically called a "doctor of philosophy" degree. This is misleading because PhD holders are not necessarily philosophers (unless they earned their degree in philosophy!). That said, PhD recipients are able to engage in thought experiments, reason about problems, and solve problems in sophisticated ways.
Research in Natural Studies is vital to understanding how the earth works and how its various systems interact with one another. Those who study Natural Science on the doctoral level will be in a position to lead these studies. A PhD in Natural Science is the degree required for research and instruction in this area of science.
Education in the United States is mainly provided by the public sector, with control and funding coming from three levels: state, local, and federal, in that order. The common requirements to study at a higher education level in United States will include your admissions essay (also known as the statement of purpose or personal statement), transcript of records, recommendation/reference letters, language tests
Request Information Doctoral Programs in Natural Sciences in San Francisco in USA 2017
The Philosophy, Cosmology, and Consciousness program endeavors to cultivate in its graduate students both intellectual rigor and sympathetic imaginative faculties for entering fruitfully into a multiplicity of world views, historical eras, and cultural sensibilities. [+]