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Energy Cycles - Tuesday February 4 2014 Energy Cycles The...

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Tuesday February 4, 2014: Energy Cycles The Carbon Cycle The amount of carbon is lowest when the sun hits the Northern Hemisphere; highest when the sun hits the Southern Hemisphere because the majority of biomass is found in the Northern Hemisphere. Time Scale: ( Possible due to carbon traces in fossils) - Quaternary: Right now (evolution of humans) - Tertiary: Mammal diversity - Cretaceous: extinction of dinosaurs, first primates, first flowering plants - Jurassic: first birds, dinosaurs diversify - Triassic: first mammals, first dinosaurs - Permian: major extinctions, reptiles diversify - Pennsylvanian/Mississippian: first reptiles, scale trees, seed ferns - Devonian: first amphibians, jawed fishes diversify - Silurian: first vascular land plants - Ordovician: sudden diversification of metazoan families - Cambrian: first fishes, first chordates, first skeletal elements, first animal traces, first soft- bodied metazoans The Phosphorus Cycle Phosphorus starts its existence as phosphate ions (PO 4 ) in the rocks of the world. When it
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