Explain the roles of demand and supply in changing gasoline prices after hurricane katrina and rita

In the immediate aftermath of hurricane Katrina and Rita, supply of gasoline was very low, as suppliers of gasoline,were unable to bring gas to the stations. This raised prices drastically as demand increased due to people fleeing the devastation.

Some common minerals in the natural world are quartz, feldspar and mica. These 3 common rock forming minerals can occur in both sedimentary rocks like a sandstone or in a granitic rock like true granite. If they occur in a granite it quite likely formed in molten conditions deep within the earth's crust like in the depths of the zone of subduction in or near the mantle. As the molten material or magma moved up towards the surface through the crust it would cool off as it encountered cold solidified country rocks closer to the surface and then it would cool also and as it cooled the minerals would form-first the high temperature minerals like plagioclase feldspar and then progressively lower temperature minerals like orthoclase feldspars, mica and then quartz. Then, as for a sandstone, it forms from sand which  may be derived from the weathering of say a granite into its constituent minerals like quartz, feldspar and mica and then these being washed down say to the sea where they form say alluvial fans which then with the accumulated weight of overlying sediments gets converted into a rock ie a type of sandstone.