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from article Moho (Mohorovicic discontinuity)

Characteristics of waves traveling along the Moho. (a) Schematic cross section of the continental crust and upper mantle showing typical wave paths from a source of direct waves traveling near the surface of the crust, refracted waves traveling…

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from article Moho (Mohorovicic discontinuity)

Contour map of Moho depth in the United States. Contour values are given in miles (kilometers). (After R. J. Allenby and C. C. Schnetzler, United States Crustal Thickness, Tectonophysics, 93:13–31, 1983)

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from article Travertine

Travertine boulder. (Credit: U.S. National Park Service)

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from article Mineral

Peridot is a variety of olivine. Gem-quality peridot, as seen here, is transparent to translucent and pale-, clear-, or yellowish-green in color. (Credit: Albert Russ/Shutterstock)

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from article Palynology

Pollen and spore morphology, (a, b) Spores. (c–j) Pollen grains. (After Y. Iwanami, T. Sasakuma, and Y. Yamada, Pollen: Illustrations and Scanning Electron Micrographs, Kodansha and Springer, 1988)

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from article Palynology

Pollen morphology and sporoderm ultrastructure of Cabomba caroliniana (Cabombaceae), a modern water lily and primitive flowering plant. (a) Distal view of grain. (b) Cross section through the entire grain. (c) Cross section through the sporoderm.

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from article Diorite

Diorite. (Credit: Siim Sepp/Alamy Stock Photo)

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from article Stylolites

Stylolite in limestone.

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from article Rickettsioses

Coxiella burnetii (shown in yellow color), the causative bacterial agent of the rickettsial disease (rickettsiosis) known as Q fever, in an infected cell. (Photo courtesy of Robert Heinzen, Elizabeth Fischer, and Anita Mora, National Institute of…

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from article Genetic dominance

The crossing of tall (dominant AA) and short (recessive aa) homozygous plants in the parent (P1) generation leads to tall heterozygotes (Aa) in the F1 generation of offspring. This is an example of genetic dominance. In the F2 generation, three…