7. Sun Aswan Alexandria 7.2 ° Circ. = 2 Ï r Circumference = 805 km â 50 805 km Circ. = 40,250 km r = 6400 km 7.2 ° 1 50 r = Circ. 2 Ï = 7.2° 360° 805 km Circumference = 1 50
16. Systems A systems approach to Earthâs energy balance From: Strahler & Strahler Where and how does the energy flow in this global-scale natural system?
27. Energy as a System But a scientistâs results are only as good as the data and the assumptions. What did Kelvin not know about? Convection in the mantle Heat from the radioactive decay of atomic nuclei