Search Results

Search Results

Refine this search

7,906 results

Image

from article Ctenothrissiformes

Result thumbnail
A Cretaceous ctenothrissiform fossil, Ctenothrissa sp. (order Ctenothrissiformes), on a limestone matrix found in Lebanon. Size: 90 mm (3.5 in.). (Photo courtesy of The Virtual Fossil Museum)

Image

from article Pyroclastic rocks

Result thumbnail
Distribution downwind of the pyroclastic fall deposit from the climactic eruption of Mount St. Helens, Washington, on May 18, 1980. The contours (isopachs) are drawn through points of measured equal thickness (in centimeters) of this ash layer.…

Image

from article Pyroclastic rocks

Result thumbnail
Aerial view in March 1998 of the fan-shaped pyroclastic delta formed by repeated entries of pyroclastic flows and surges into the Caribbean Sea during the Soufrière Hills Volcano eruption in 1996–1997. (Photograph by R.P. Hoblitt, USGS)

Image

from article Pyroclastic rocks

Result thumbnail
Observed or postulated mechanisms for the generation of pyroclastic flow and surge deposits (from W. E. Scott, 1989). (a, b) Mechanisms that commonly produce block-and-ash flow deposits. (b, c) Mechanisms that trigger laterally directed blasts.…

Image

from article Pyroclastic rocks

Result thumbnail
Some variations in pyroclastic rock formations. (a) Layers of pyroclastic fall deposits from the eruption plume of the June 15, 1991, explosive eruption of Mount Pinatubo (Luzon, Philippines). This exposure, located about 9 km (5.5 mi) southeast of…

Image

from article Dewar flask

Result thumbnail
Two typical Dewar containers.

Image

from article Propagator (field theory)

Result thumbnail
Feynman diagrams for scattering processes. (a) Electron-proton scattering via photon exchange. (b) Proton-proton scattering via meson exchange.

Image

from article Conservation of energy

Result thumbnail
The conservation of energy allows energy to be interconverted among many different forms. In the use of wind power, for example, the kinetic energy of wind (movements of air) can be converted by turbine blades into electrical energy. (Credit: Ron…

Image

from article Electrical units and standards

Result thumbnail
Calculable capacitor. (a) Cross section of general cylindrical capacitor with four segments. (b) Cross section of symmetrical capacitor with cylindrical electrodes. (c) Calculable capacitor used in absolute determination of the ohm. (U.S. National…

Learn more about AccessScience

a female college student looking at the screen of her silver-cased laptop computer
Watch the YouTube video

flyer thumbnail

Download the flyerGet Adobe Acrobat Reader pdf icon