Final answer:
The correct statement about the gravity model is that interaction is inversely proportional to distance, aligning with the principles of gravitational force in physics.
Step-by-step explanation:
The gravity model in human spatial interaction suggests that the degree to which two places interact is inversely proportional to the distance between them. Hence, the correct answer to the question 'Which statement correctly describes the gravity model as it relates to human spatial interaction?' is A) Interaction is inversely proportional to distance.
This concept aligns with Newton's universal law of gravitation in physics, which states that the gravitational force is directly proportional to the product of the masses of two objects and inversely proportional to the square of the distance between them. In the context of geographic applications, a similar principle is used to understand that as the distance between two places increases, the volume of interaction, such as trade or communication, tends to decrease.