Search results
Results From The WOW.Com Content Network
A natural phenomenon is an observable event which is not man-made. Examples include: sunrise, weather, fog, thunder, tornadoes; biological processes, decomposition, germination; physical processes, wave propagation, erosion; tidal flow, and natural disasters such as electromagnetic pulses, volcanic eruptions, hurricanes and earthquakes. [1] [2]
Limestone pavement – Natural karst landform consisting of a flat, incised surface of exposed limestone; Mesa – Elevated area of land with a flat top and sides, usually much wider than buttes; Mushroom rock – Naturally occurring rock whose shape resembles a mushroom; Natural arch – Arch-shaped natural rock formation
Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...
A natural product is a natural compound or substance produced by a living organism—that is, found in nature. [2] [3] In the broadest sense, natural products include ...
The schematic diagram indicates the roles of insufficient DNA repair in aging and cancer, and the role of apoptosis in cancer prevention. An excess of naturally occurring DNA damage, due to inherited deficiencies in particular DNA repair enzymes, can cause premature aging or increased risk for cancer (see DNA repair-deficiency disorder).
The study of the ecological role of toxic chemicals (often pollutants, but also naturally occurring compounds). ecozone An area that has characteristics of natural origin such as climate, terrain, vegetation, etc. It may used as a synonym for biogeographic realm. El Niño
Selenium has seven naturally occurring isotopes. Five of these, 74 Se, 76 Se, 77 Se, 78 Se, 80 Se, are stable, with 80 Se being the most abundant (49.6% natural abundance). Also naturally occurring is the long-lived primordial radionuclide 82 Se, with a half-life of 8.76×10 19 years. [ 10 ]
Alkaloids are a broad class of naturally occurring organic compounds that contain at least one nitrogen atom. Some synthetic compounds of similar structure may also be termed alkaloids. [2] Alkaloids are produced by a large variety of organisms including bacteria, fungi, plants, and animals. [3]