Answer:
The crust because is the thinnest layer
Rome gets its water from lake Bracciano and the aqueducts, which supplied fresh water to public baths and for drinking water, in large cities across the empire, and set a standard of engineering that was not surpassed for more than a thousand years.
Crude oil simply because once used it gets exhausted
To add to their income, farmers in India may "sell land to other farmers" since this can be a very profitable exercise that doesn't do much to decrease productivity of the primary farm.
