Which of these is not a physical feature in the United States? Pacific Ocean Frio River Lake Travis Rocky Mountains​

Ascenario that doesnt  include any modern objects like electricity

Ithink the answer is either a , c or d

Do u know the answer i really need it now

If a particular resource is not useful or needed then the price would be considerably low. once that resource is needed the price or value will raise depending on how useful or needed it is especially if the resource is low in quantity, the consumers would pay whatever they have to, to get that material.