Highly detailed summary notes of OCR A Level geography's specification on earth's life support systems. Includes notes on all 4 subtopics: 4.1 How important are water and carbon to life on earth, 4.2 How do the water and carbon cycles operate at contrasting locations, 4.3 How much change occurs over time in the water and carbon cycles & 4.4 To what extent are the water and carbon cycles linked.