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from article Atmospheric chemistry

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The nitrogen cycle has important implications for air quality and climate in addition to fisheries and marine ecosystems. Anthropogenic activities have perturbed the natural nitrogen cycle, with major effects on the atmosphere and marine systems.…

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from article Atmospheric chemistry

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Components of the carbon cycle showing the movement of carbon between land, the atmosphere, and oceans. Yellow numbers are natural fluxes, and red are human contributions in gigatons of carbon per year. White numbers indicate stored carbon. (NASA:…

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from article Life forms of plants

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Life forms of plants according to C. Raunkiaer. (After P. Dansereau, Biogeography: An Ecological Perspective, Ronald Press, 1957)

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from article Echolocation

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Echolocation is a physiological tool used by gray bats (Myotis grisescens). (Credit: Amareta Kelly)

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from article Echolocation

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Sound spectrograms representing sonar signals of (a) Brazilian or Mexican free-tailed bats (Tadarida brasiliensis), (b) big brown bats (Eptesicus fuscus), (c) Wagner's mustached bats (Pteronotus personatus), and (d) greater horseshoe bats…

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from article Hydrosphere

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Dissolved (a) sodium and (b) sulfate in rain (in parts per million) over the continental United States (After R. M. Garrels and F. T. Mackenzie, Evolution of Sedimentary Rocks, W. W. Norton, 1971)

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from article Hydrosphere

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Accommodation of cations in aqueous solution. (After H. Blatt, G. Middleton, and R. Murray, Origin of Sedimentary Rocks, Prentice Hall, 1972)

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from article Hydrosphere

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Distribution of dissolved gaseous oxygen (low values) and nutrient species (high concentrations) of orthophosphate ions at 26°22′.4N and 168°57′.5W in the Pacific Ocean. 1 m = 3.3 ft.

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