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from article Tanaidacea
Leviapseudes bipartitus. [K. Larsen, Deep-Sea Tanaidacea (Peracarida) from the Gulf of Mexico, Brill, Leiden, 2005]
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Image
from article Tanaidacea
Typhlotanais ohtsukae: (top) female; (bottom) male. [K. Larsen and M. Shimomura, Tanaidacea (Crustacea: Peracarida) from Japan: II. Tanaidomorpha from the East China Sea, the West Pacific Ocean and the Nansei Islands, Zootaxa, 1464:1–43, 2007]
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from article Rock mechanics
Typical rock mass containing numerous discontinuities. The person in picture is conducting a scanline survey, where a tape is placed across the rock and detailed information is gathered on the fractures that intersect the scanline.
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from article Rock mechanics
(a) Uniaxial compression test, where an axial stress is applied to a core sample of rock and increased until failure. (b) Triaxial compression test, where a constant confining stress is first applied, then the axial stress is increased until failure.
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from article Rock mechanics
Image
from article Rock mechanics
(a) Example of the failure zone around an underground excavation (×, shear failure; o, tensile failure), calculated using the Rocscience Phase2 computer program. (b) Example of a shallow underground excavation where the failure mode is either…
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from article Rock mechanics
Image
from article Cassiduloida
Major features of cassiduloids as shown on a test of Cassidulus caribaearum (a Caribbean species) with spines (upper two figures) and without spines (lower two figures). Top (aboral) views are shown on the left; bottom (oral) views are shown on the…
Image
from article Rhynchosauria
Skull (dorsal view) of the rhynchosaur Paradapedon.
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from article Atmospheric acoustics
Frequency dependence of attenuation coefficient in units of decibels per 100 m (dB/328 ft), temperature of 20°C (68°F), and a relative humidity of 70%. Total attenuation from air absorption and contributions from classical absorption (that due to…
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from article Atmospheric acoustics
Diagram of reflection of sound from a flat ground surface with impedance Z, showing direct (R1) and reflected (R2) paths from source to receiver, source height hs, microphone height h, distance of propagation d, and angle of incidence or grazing…
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from article Atmospheric acoustics
Relative sound pressure levels (SPL) for propagation from a source over mown grass for source height of 1.8 m (6 ft), microphone height of 1.5 m (5 ft), and distances of propagation indicated.
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from article Atmospheric acoustics
Curved ray paths. (a) Refraction downward, during temperature inversion or downwind propagation. (b) Refraction upward, during temperature lapse or upwind propagation.
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from article Atmospheric acoustics
Representative long-range ray paths of sound radiating from a source in the atmosphere and traveling from west to east in Northern Hemisphere in winter. 1 km = 0.6 mi. (After T. F. Malone, ed., Compendium of Meteorology, American Meteorological…
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from article Atmospheric acoustics
Contour plot of sound levels in the presence of upward refraction in a turbulent atmosphere. The source is very close to the ground at zero range. The white areas are regions of higher sound levels.
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from article Atmospheric acoustics
Facsimile record of acoustic echo sounding of atmosphere at the South Pole, February 9, 1975. 300 m = 984 ft, 600 m = 1969 ft. Dark regions above 300 m altitude correspond to temperature inhomogeneities associated with the passage of convective…
Image
from article Surface waves
Definition sketch for an oscillatory wave.
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from article Surface waves
Fluid particle orbital motions in deep-and shallow-water oscillatory waves. SWL = still-water level.
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from article Surface waves
Definition sketch for a solitary wave. SWL = still-water level.
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from article Surface waves
Definition sketch for a surge wave.
Image
from article Blattodea
American cockroach (Periplaneta americana). (Credit: Antagain/iStockphoto/Getty Images)
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from article Blattodea
The Madagascar hissing roach (Gromphadorhina portentosa) can compress its body and force air through modified spiracles (breathing pores), producing a loud hissing sound. (Credit: Alamy)
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from article Layered intrusion
Sequence of crystallization from basaltic magma. (a) Hypothetical phase diagram showing the derivation of the sequence olivine cumulate, orthopyroxene-olivine cumulate, orthopyroxene cumulate, as observed in cyclic units near the base of many…
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from article Layered intrusion
A sequence of layers of near-constant thickness and aspect that show a rather abrupt transition from a base rich in pyroxene (pyroxene-plagioclase cumulate) to a top composed nearly entirely of plagioclase (plagioclase cumulate). Ice axe is…
Image
from article Layered intrusion
Photomicrograph of an olivine cumulate from the LaPerouse gabbro. Early-crystallized olivine grains (ol; now fractured and incipiently altered) are enclosed in interstitial plagioclase (pl) and orthopyroxene (px). Mineral proportions suggest that…
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from article Layered intrusion
Repetitive darker layers of pyroxene cumulates within a thick sequence of relatively monotonous orthopyroxene-plagioclase cumulates, Dufek intrusion, Antarctica. Total thickness of cumulates shown is 1750 ft (530 m). (Art Ford, U.S. Geological…
Image
from article Astrapotheria
Skeleton of Astrapotherium magnum. The genus Astrapotherium is known from the late Oligocene to the late Miocene.
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from article Lycopsida
Lycopodium clavatum, a representative homosporous lycopsid. (a) Sporophyte showing typical rhizomatous growth and paired cones. (b) Microphyllous leaf. (c) Sporophyll bearing a sporangium on the upper surface. (From K. R. Sporne, The Morphology of…
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from article Weather forecasting and prediction
Correlation coefficients between 3-day, 4-day, and 5-day forecasts of sea-level pressure made by the National Meteorological Center and observed sea-level pressure. Domain of verification is North America and adjacent ocean areas. (Courtesy Wayman…
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from article Weather forecasting and prediction
The quality of weather forecasts, defined as the product of the accuracy and detail achievable, depicted schematically as a function of lead time for two different forecasting methods. Traditional forecasts based on numerical weather prediction deal…
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from article Weather forecasting and prediction
Daily average temperature at Des Moines, Iowa. The thinnest curve indicates daily average temperature for January 1–December 31, 1994. The thickest curve indicates the 90-day running mean. The remaining curve indicates the 30-year average of daily…
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from article Marsupialia
Skull and jaws of marsupials. (a) Didelphidae, Didelphis (the carnivorous opossum of North America), Recent, with polyprotodont incisors (I 5/4). (b) Phalangeridae, Trichosurus (the herbivorous opossum of Australia), Recent, with diprotodont…
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from article Marsupialia
Views of the soles of the left hindfoot of marsupials. (a) Didelphidae, Didelphis, representing the five-toed, polydactylous condition. (b) Phalangeridae, Trichosurus, representing the five-toed, syndactylous condition (digits II and III are bound…
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from article Glacial geology and landforms
Worldwide glaciation: (a) present distribution and (b) 18,000 years ago at the maximum of the Late Wisconsinan. (Modified from T. L. McKnight and D. Hess, Physical Geography, 6th ed., 2000)
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from article Glacial geology and landforms
Striations and chattermarks on bedrock in front of Omsbreen, Norway, ice moving from right to left. People are shown for scale.
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from article Glacial geology and landforms
Erratic boulder, approximately 3 m (10 ft) high, sitting on the side of a field in southern Ontario, Canada.
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from article Glacial geology and landforms
Large pothole (glacial P-form), Finland. (Geological Survey of Finland).
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from article Glacial geology and landforms
Roche moutonée, approximately 25 m (80 ft) in length in front of the Nigardsbreen Glacier, Norway, with ice moving from right to left.
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from article Glacial geology and landforms
Fluted and streamlined bedrock forms: (a) small-scale flutes, Wilton, Ontario; (b) P-forms in bedrock, Espanola, Ontario; (c) subglacial meltwater erosion marks; and (d) P-forms, Espanola, Ontario (scale card is 8.5 cm long).
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from article Glacial geology and landforms
U-shaped valley, Muick, Scotland.
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from article Glacial geology and landforms
Erosional landscape system for alpine glaciation. (a) Region during period of maximum glaciation. (b) Glaciated topography. (Modified from E. J. Tarbuck and F. K. Lutgens, 2003)
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from article Glacial geology and landforms
Rogen moraine near Uthusslön, Sweden. (Courtesy of Jan Lunqvist)
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from article Glacial geology and landforms
Drumlin S. (a) General model, showing the variability of the internal composition. (b) Green Bay Lobe, Wisconsin. Ice direction from the upper right to lower left. (Courtesy of D. Setz)
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from article Glacial geology and landforms
Fluted moraine, Storbreen Glacier, Norway. Note boulder at he head of the flute; ice direction bottom right to middle left.
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from article Glacial geology and landforms
End moraine. (a) Findelen Glacier, Switzerland (courtesy of J. Matthews). (b) Sequence of retread of end moraines from Storbreen Glacier, Norway.
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from article Glacial geology and landforms
Esker ridge, Bylot Island, Canada. (Courtesy of C. Zdanowicz)
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from article Glacial geology and landforms
Models of (a) land-based glacial depositional system and (b) depositional system of an ice mass with a marine moraine.
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from article Glacial geology and landforms
Late Wisconsinan end moraines of the Green Bay Lobe, Lake Michigan Lobe, and Huron-Erie Lobe. (Modified from J. C. Frye and H. B. Willman, 1973)
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from article Pholidota
Pangolin (genus Manis, order Pholidota). (Photo courtesy of the Wildlife Alliance)
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from article Playa
Dry lakebed, or playa, with the Warner Mountain Range, northeastern California, in the distance. (USGS).
