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Answer:
It means that an object at rest from a point of view of another object (in reference) of another object may not be at rest. For example, when you are in a moving car, you're at rest in respect to the car. A person on the ground will see you moving along with the car.
Explanation:
Combined with other factors such as overgrazing, poor land management, and overpopulation, the drought led to a substantial increase in barren land, particularly on slopes, due to the comparative difficulty of cultivating sloping land. Uncultivated, the soil experienced increased erosion and compaction.