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Typical plot of minimum value of nτ necessary for net release of energy versus ion kinetic temperature in a mixture containing equal amounts of deuterium and tritium. (After J. M. Hollander, ed., Annu. Rev. Energy, 1:213–255, 1976)

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from article Forest ecosystem

Forest in Moran State Park on Orcas Island, Washington. (Credit: Chris Willig)

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from article Forest ecosystem

Forest fire in No Name Creek area of Colorado. (Credit: Andrea Booher/FEMA)

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from article Forest ecosystem

Puma and cub in forest. (Credit: Grant Faint/Stockbyte/Getty Images)

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from article Forest ecosystem

Conceptual model of elemental cycling in a terrestial ecosystem, emphasizing the presence and activities of arthropod consumers. The indirect regulation of elemental movement by arthropods is indicated by the hourglass-shaped valves on these flows.…

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from article Forest ecosystem

The southern pine beetle (Dendroctonus frontalis) is a destructive insect pest of coniferous forests in the southern United States. (Credit: U.S. Forest Service)

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from article Forest ecosystem

Belowground food web. (Credit: Elaine Ingham)

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from article Tangent

Line L tangent to curve C at P.

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from article Convection in the Earth

Pattern of magnetic stripes over the Reykjanes Ridge southwest of Iceland. (After J. R. Heirtzler, X. LePichon, and J. G. Baron, Magnetic anomalies over the Reykjanes Ridge, Deep Sea Res., 13:427, 1966)

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from article Convection in the Earth

Geographic setting of the Kurile Trench off the Kamchatka Peninsula, showing the deep ocean trench and the characteristic line of volcanoes in the vicinity of the subduction zone. The sections A′ and B′ illustrate the bathymetry normal to the trench…