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Volcanic gas sampling. Samples of volcanic gases and rocks may be collected and analyzed for their chemical-element content to better understand changes related to volcanic activity as well as to gain a greater understanding of the carbon and sulfur…

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from article Derris

Derris elliptica. (Photo courtesy of Forest and Kim Starr)

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from article Sphaeractinoidea

Sphaeractinoid Actinostromaria rhodaclada, Cretaceous, Jura Mountains: (a) tangential and (b) longitudinal section, ×6. (From A. Steiner, 1932)

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from article Poppy

Stems, fruits (capsules), and flower of the opium poppy (Papaver somniferum). By cutting into the fruits soon after the petals have fallen, the opium is obtained. (Credit: Milan Kořínek)

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from article Lithosphere

Representation of oceanic and continental lithosphere as defined by thermal structure. Also shown are representative crustal and lithospheric thicknesses.

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from article Plant pigment

Photosynthetic spectra of higher plants. (Left) Absorption spectra for chlorophyll a, chlorophyll b, and the carotenoids, showing the wavelengths of visible light that support photosynthesis. (Right) Action spectrum for photosynthesis. (Copyright ©…

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from article Plant pigment

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from article Plant pigment

The autumn colors of leaves are produced by carotenoid pigments. During the autumn, leaves stop their production of chlorophyll, providing the opportunity for the orange and yellow carotenoid colors observed in autumn leaves to predominate. In…

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from article Plant pigment

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from article Arthropoda

The insects are the largest group within the phylum Arthropoda. Some of the most visually appealing insects are the butterflies (order Lepidoptera). (Credit: Shutterstock)