Final answer:
The decline of the Harappan Civilization was caused by geologic, climatic, and environmental changes, impacting food supply and leading to the collapse of urban areas and trade networks.
Explanation:
The decline of the Harappan Civilization was influenced by various factors including geologic, climatic, and environmental changes.
Earthquakes, flooding, shifts in the course of the Indus, less rainfall, and deforestation all impacted the environment's suitability for farming, leading to food supply disruptions.
As a result, urban areas faded away, trade networks diminished, and the region reverted to rural conditions, ultimately causing the collapse of the civilization.
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