Final answer:
Physical geography is the field of study that looks at the physical features of Earth and includes sub-disciplines such as geomorphology and climatology. It is a part of the natural sciences and relates to other disciplines like biology in the study of ecology.
Step-by-step explanation:
Fields of study that explore the physical features of nature and the ways in which they interact and change are considered to be within the realm of physical geography. This discipline is part of the broader field of geography and emphasizes the study of the Earth's lithosphere, atmosphere, hydrosphere, and biosphere, as well as the interrelationships among these components. Physical geography is a multifaceted field that includes sub-disciplines like geomorphology, glaciology, coastal geography, climatology, and biogeography, each focusing on different aspects of the planet's physical landscape.
Beyond physical geography, fields within the physical sciences such as astronomy, physics, and chemistry delve into the study of nonliving matter, but they do not focus on the physical systems of the planet in the same manner that geography does. Natural sciences like biology also intersect with physical geography, particularly in disciplines like ecology, which requires an understanding of the physical environment to study the relationships among different living organisms.