The forces can be distinguished as follows:
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Globalization: This refers to the interconnectedness of economies, cultures, and populations across the world, often facilitated by trade, communication, and transportation. It can lead to increased movement of people and ideas across borders.
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Migration: This is the movement of individuals or groups from one place to another, often for reasons such as economic opportunities, safety, or environmental conditions. Migration specifically refers to the change of residence by people.
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Nutrient Pollution: This occurs when excess nutrients, often from agricultural runoff, enter water bodies. It primarily affects ecosystems and water quality rather than directly influencing human settlement patterns.
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Runoff: This is the flow of water, typically following precipitation, that moves across the surface of the land. Like nutrient pollution, it relates to environmental processes rather than human movement or migration trends.
Given these definitions, the force most likely to connect two different regions where people are changing residence locations is migration. Migration directly involves the movement of people, linking different geographic areas through their relocation.