Explain the relationship between energy and economic development.

"The more developed a country is, the more energy they use. The problem is that energy can currently only be realistically be made by fossil fuels or by nuclear power. Some energy can be made hydroelectric, but this is limited. Alternative energies can be created, but they produce less energy then the cost to create so do not provide any additional power. Some people believe that the output of fossil fuel plants creates warming of our planet." Hope this helps!!

The answer would be sand and gravel