Pe­ople who owe money have a approach of turning the desk on their creditors by declaring that one cannot get blood from a stone. Because of the abolition of debtors' prison, this remains true. You can't get blood from a stone, positive. But what about oil? Many oil analysts and researchers consider that we humans have reached the point at which the quantity of typical oil accessible all through the world has reached decline. This is called peak oil. Since oil is a nonrenewable resource, the availability is limited. One of many more promising reserves of oil that hasn't been commercially exploited yet is oil shale. This is essentially oil trapped in solid type inside rock. One hundred million years ago, a wide swathe of sea reduce the North American continent into japanese and western portions. As sea levels lowered, this sea receded, leaving in its wake inland seas and lush grasslands.