Limestone is a sedimentary rock that is composed primarily of calcite. It forms from both the chemical precipitation of calcium carbonate and the transformation of shell, coral, fecal and algal debris into calcite during diagenesis.
To calcu-late the PPF, suppose that Crusoe puts all 8 hours into gathering fruit, so that he gets 36 pounds. But there is no time left for fishing, so he gets 0 pounds of fish. If he takes an hour off from gathering fruit, he gets 35 pounds of fruit and has an hour in which to fishâso he gets 4 pounds of fish.The rest of the PPF is con-structed similarly. 2.ut there is no time left for fishing, so he gets 0 pounds of fish. If he takes an hour off from gathering fruit, he gets 35 pounds of fruit and has an hour in which to fishâso he gets 4 pounds of fish. The rest of the PPF is con-structed similarly. 2.
Defoe made lots of changes to Selkirk's tale. He moved the island to the Caribbean and peopled it with cannibals, one of whom becomes Crusoe's faithful servant Friday. While Selkirk was stranded for a mere four years, the fictional Crusoe spends 28 years, two months and 19 days as a castaway, as he meticulously notes in his journal. Defoe clearly took much of his inspiration from the Caribbean, not the southern Pacific.