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from article Ordovician
Ordovician, the second period of the Paleozoic Era.
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from article Ordovician
Early Ordovician (Arenig) paleogeography, major rock suites and potential ocean surface currents; based on remanent magnetism data supplemented by plots of the positions of shelf sea carbonates and reefs.
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from article Clover
Red clover (Trifolium pratense). (Photo by Tom Heutte, U.S. Department of Agriculture Forest Service)
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from article Clover
White clover (Trifolium repens). (Photo by Pavel Šinkyřík)
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from article Clover
Crimson clover (Trifolium incarnatum). (Photo by Pavel Šinkyřík)
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from article Clover
White sweet clover (Melilotus albus). (Photo by Forest and Kim Starr)
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from article Clover
Leaves of clover affected by leaf spot, which is caused by the fungus Pseudopeziza trifolii. (Photo courtesy of the U.S. Department of Agriculture Cooperative Extension Slide Series, Clemson University)
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from article Buxbaumiidae
Morphological features of Buxbaumiidae. (a) Sporophyte of Buxbaumia aphylla (after W. H. Welch, Mosses of Indiana, Indiana Department of Conservation, 1957). Diphyscium foliosum (b) habit sketch, (c) leaves and (d) perichaetial leaf (after H. S.…
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from article Granite
Classification of granitic rocks by the IUGS scheme. All proportions are by volume percentages.
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from article South America
Map of South America.
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from article South America
Andes Mountains, Chile. The Andes, which parallel the Pacific coast, constitute one of the Earth's most majestic features. Only the Himalayas exceed them in elevation and mass. (United Press International)
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from article South America
Representative view of the hilly uplands and low mountain country of the Guiana Highlands. One of five waterfalls on the Canaima River, Gran Sabana in southern Venezuela. (Venezuelan Information Service)
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from article South America
Uplifted beaches on desert coast, east side of San Juan Bay, Departmento de Ica, Peru. The sea cliff is about 100 ft (30 m) high. Each horizontal line represents a former beach. (Photograph by F. Atchley)
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from article South America
Port of Matarani on the desert coast of southern Peru. This oblique aerial view looks coastwise southward over one of the world's driest and most barren coastal zones. (Servicio Aerofotográfico Nacional)
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from article Plant physiology
The process of photosynthesis is a key feature of plant physiology. Chloroplasts (cell plastids that contain chlorophyll) use solar energy to manufacture carbohydrates and other large molecules. Mitochondria break down these molecules, thereby…
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from article Plant physiology
Adoption of genetically modified crops in the United States for the period of 1996 to 2016. Herbicide-tolerant (HT) soybeans, cotton, and corn have been modified genetically to survive the application of specific herbicides that previously would…
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from article Zosterophyllopsida
Examples of Devonian Zosterophyllopsida. (a) Reconstruction of the Early Devonian Zosterophyllum rhenanum, here depicted as an aquatic plant (after R. Kräusel and H. Weyland, Neue Pflanzenfunde im rheinischen Unterdevon, Palaeontographica B,…
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from article Bytownite
Bytownite, from Crystal Bay, Minnesota. (Specimen from Department of Geology, Bryn Mawr College)
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from article Geraniales
A common eastern United States species of geranium (Geranium maculatum), which is characteristic of the order Geraniales. (Photo by Jennifer Anderson; USDA-NRCS PLANTS Database)
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from article Koji mold (Aspergillus oryzae)
Koji molds and related fungi. Left to right: Aspergillus oryzae, A. sojae, and A. flavus. Top: Colonies grown on agar plates. Bottom: Microscopic images of conidia (spores). (Credit: T. Okuda/Tamagawa University Research Institute, Japan)
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from article Koji mold (Aspergillus oryzae)
Food manufacturing processes: (a) sake production; (b) miso production; (c) shoyu production. (Copyright © McGraw Hill)
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from article Koji mold (Aspergillus oryzae)
Koji production as one of the processes of sake production in the Edo Era, Japan. Steamed rice is spread on straw mats for cooling (right) and then mixed with Tane-koji (next place to the left). The room at the back is the koji-muro. (Credit: Nihon…
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from article Ornamental plants
Colorful ornamental plants in a garden. (Credit: Getty Images/iStockphoto)
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from article Metamorphic rocks
Fabrics of metamorphic rocks under microscope. (a) Mortar fabric; (b) flaser or mylonitic fabric; (c) granoblastic fabric (after E. E. Wahlstrom, Petrographic Mineralogy, John Wiley and Sons, 1955). (d) Lepidoblastic fabric; (e) nematoblastic…
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from article Metamorphic rocks
Diagram showing the general relationship between deformation folding and slaty cleavage caused by pressure PP or the couple ScSc. Heavy black lines denote the original bedding deformed into folds. Thin lines indicate slaty cleavage which may grow…
