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from article Messier Catalog
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from article Red Sea
Division of the Red Sea into regions representing different stages in the formation of an ocean basin. (After F. Martinez and J. R. Cochran, Structure and tectonics of the northern Red Sea: Catching a continental margin between rifting and drifting,…
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from article Precipitation (chemistry)
Precipitation of calcium fluoride. (Copyright © McGraw-Hill Education/Stephen Frisch)
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from article Immunity
The immune response to an invading microbe can generate immunity via antibody production. Steps: (1) Antigen binds to a B cell receptor (antibody) on a B cell. (2) The B cell may also receive more information from a helper T cell about the presence…
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from article Immunity
Colored scanning electron micrograph of an activated human macrophage. Activation of macrophages is often an important aspect of the immune response. (Credit: Steve Gschmeissner/Science Photo Library/Alamy Stock Photo)
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from article Immunity
Colored scanning electron micrograph of B lymphocytes. These white blood cells are involved in the immune response. (Credit: Steve Gschmeissner/Science Photo Library/Alamy Stock Photo)
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from article Polystyrene
Polystyrene foam. (Credit: Raywoo/123RF)
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from article Basalt
Devils Postpile, Mammoth Lakes, California, United States, which formed about 82,000 years ago, is a great example of columnar basalt. (Credit: U.S. National Park Service)
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from article Basalt
Thin section of upper crust of lava about 3 cm from top; black is microcrystalline groundmass. 0.5 mm = 0.02 in.
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from article Basalt
Thin section of interior of lava shown in Fig. 1, but 7.9 m (26 ft) below the top of the flow. Clear plagioclase crystals are ophitically enclosed in large pyroxene grains up to 1 mm in diameter. Crystals of black magnetite are minor. A few…
