The term natural science as the way in which different fields of study are defined is determined as much by historical convention as by the present day meaning of the words.
Thus the traditional description of natural science is the study of the physical, nonhuman aspects of the Earth and the universe around us. As a group, the natural sciences are distinguished from theology and the social sciences, on the one hand, and from the arts and humanities on the other. Mathematics is not itself a natural science, but provides many tools used within the natural sciences. Natural sciences generally attempt to explain the workings of the world via natural processes rather than divine processes. The term natural science is also used to identify "science" as a discipline following the scientific method.
Alongside this traditional usage, more recently the words "natural sciences" are sometimes used in a way more closely matching their everyday meaning. In this sense "natural sciences" can be an alternative phrase for biological sciences, involved in biological processes, and are distinguished from the physical sciences (involved in the physical and chemical laws underlying the universe).
The History of Recent Science and Technology (http://hrst.mit.edu/)
Reviews of Books About Natural Science (http://www.scibooks.org/) This site contains over 50 previously published reviews of books about natural science, plus selected essays on timely topics in natural science.
NaturalScience - Hampshire College - Amherst, MA Academics
In our view the naturalsciences form a set of theories, methods, and data for understanding the world in which we live.
Beyond the foundational skills and core studies on which all scientific work is based, the School of NaturalScience provides depth, focus and unusually rich learning and research opportunities for interdisciplinary study in two topical areas: environmental sciences/agriculture studies and health sciences.
Thus the traditional description of naturalscience is the study of nature: the physical, nonhuman aspects of the earth and the cosmos.
Together, the natural and applied sciences are distinguished from the social sciences on the one hand, and from the humanities, theology and the arts on the other.
In this sense "naturalsciences" can be an alternative phrase for biological sciences, involved in biological processes, or perhaps also the earth sciences, as might distinguished from the physicalsciences (more directly involved in the study of physical and chemical laws underlying the universe).