D. exhausting a natural resource is not sustainable
Answer: b. possible soil creep
Explanation:
Erosion can be defined as the process in which the top layer of the soil is removed because of the action of the agents like wind, water, chemicals, and others. Possible soil creep no agent is mentioned responsible for the soil creep whether it is because of gravity, water, or wind. Evidence of a past debris indicate that the erosion has occurred and displaced the debris from its place. Rapid river can also become an agent in South America. Sand storm will involve the blow of sand with the action of wind in Sahara Desert.
The first form of democracy was direct democracy
