Concept:
Definitions of human geography illustrate the evolution of the field. Early definitions often focused on the dynamic interaction between humans and their physical environment.
Step 1: Analyzing the Quote.
The definition mentions "unresting man" (highlighting human activity and cultural evolution) and "unstable Earth" (highlighting the dynamic, ever-changing nature of the physical world). This emphasizes that the relationship between the two is never static; it is a "changing relationship."
Step 2: Identifying the Geographer.
Ellen Churchill Semple, an American geographer and a student of Friedrich Ratzel, is the author of this definition. She was a strong advocate of environmental determinism, though her definition captures the dynamism of both nature and humanity.
Step 3: Differentiating from others.
• Friedrich Ratzel: Defined it as the synthetic study of the relationship between human societies and the Earth's surface.
• Vidal de la Blache: Offered a more "possibilistic" view, focusing on the conception resulting from the knowledge of physical laws.