Final answer:
Geography is the social science that can be classified as a natural science, as it studies Earth's physical characteristics and human-environment interactions.
Step-by-step explanation:
Among the options listed - psychology, geography, history, and economics - geography is the social science that can also be classified as a natural science. This is because geography encompasses the study of the Earth's landscapes, environments, and the complex relationship between humans and their environment, which taps into the physical aspects of the Earth, such as climate, soil, water, and life forms. Fields like geochemistry or physical geography are explicitly connected to natural science disciplines like chemistry and earth science. In contrast, psychology focuses on the individual's mentality, perception, and psyche, while history deals with the record of past events, and economics examines the production, distribution, and consumption of goods and services, all majorly applying qualitative assessments rather than the quantitative empirical methods typically used in the natural sciences.