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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 Sphaeractinoidea

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

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from article Cable television system

Cable television systems with (a) coaxial feeder cables and (b) optical-fiber feeder cables.

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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 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)

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from article Arthropoda

Crustaceans constitute some of the most notable arthropods. The Chesapeake blue crab (Callinectes sapidus) is native to the western Atlantic Ocean and Gulf of Mexico. (Credit: Sandy Franz/Getty Images)

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from article Arthropoda

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from article Arthropoda

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from article Arthropoda

Fossil of a trilobite, showing its distinctive flattened oval shape and crosswise division of the body (into a head, a thorax, and a pygidium). (Credit: Shutterstock)

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from article Lissamphibia

Pedicellate teeth in Lissamphibia: (a) salamander; (b) apodan; (c) frog. Teeth are from the lower jaw (a, b) or upper jaw inverted (c) and are viewed from inside the mouth. (After T. Parsons and E. E. Williams, The teeth of Amphibia and their…