Answer:
As economies advance, they require more energy. Given today's focus on greenhouse gases, coal usage will decrease. Natural gas is plentiful and is easily used for heat and as a feedstock for chemical production. Petroleum is also readily available and can be converted to energy and chemicals.
Explanation: All three resources are transportable and sources are located across the globe. However they require transportation to areas which don't have ready access. This requires roads, railways, pipelines and ships.
Fossils of the plant Glossopteris have been found on South America, Africa, India, Antarctica, and Australia. The only way these fossils can be found on continents that are separated by oceans is if the continents were once together (connected).
Rome was located<span> 15 miles up the Tiber River in order to protect the city from being raided by pirates. This also provided a source of water and a waterway to the Mediterranean Sea. The city was built on seven steep hills that allowed Romans to defend the city against enemies.</span>
