|
age grade and age set
age grade and age set differentiation of social role based on age, commonly found in small-scale societies of North America and East Africa. Age sets are a type of sodality (nonresidential groups that cut across kinship ties and thus promote broader social solidarity) of young men who usually coope...
Read more
|
|
coal
coal fuel substance of plant origin, largely or almost entirely composed of carbon with varying amounts of mineral matter.
Types
There is a complete series of carbonaceous fuels, which differ from each other in the relative amounts of moisture, volatile matter, and fixed carbon they conta...
Read more
|
|
|
school
school term commonly referring to institutions of pre-college formal education. It also properly includes colleges, universities, and many types of special training establishments (see adult education ; colleges and universities ; community college ; vocational education ).
Public Schools...
Read more
|
|
shale
shale sedimentary rock formed by the consolidation of mud or clay, having the property of splitting into thin layers parallel to its bedding planes. Shale tends to be fissile, i.e., it tends to split along planar surfaces between the layers of stratified rock. Shales comprise an estimated 55% of ...
Read more
|
|
|
molasses
molasses sugar byproduct, the brownish liquid residue left after heat crystallization of sucrose (commercial sugar) in the process of refining. Molasses contains chiefly the uncrystallizable sugars as well as some remnant sucrose. Centrifuges are used to drain the molasses off from the sucrose crys...
Read more
|
|
|
Johannes Sturm
Johannes Sturm , 1507-89, German scholar and educator. He founded (1537) and directed for more than 40 years the Strasbourg Gymnasium. His system of graded readings and classes shaped the course of studies of European secondary schools. He wrote a number of Latin textbooks. The most important of his...
Read more
|
|
Vietnam Veterans Memorial
Vietnam Veterans Memorial war memorial in Washington, D.C., built 1982. Designed by the American sculptor and architect Maya Ying Lin, it is a sloping, V-shaped, 493-ft (150-m) wall of highly polished black granite that descends 10 feet (3.05 meters) below grade level at its vertex. Often called si...
Read more
|
|
|
metamorphism
metamorphism in geology, process of change in the structure, texture, or composition of rocks caused by agents of heat, deforming pressure, shearing stress, hot, chemically active fluids, or a combination of these, acting while the rock being changed remains essentially in the solid state. Theore...
Read more
|
|
|
Mesabi
Mesabi , range of low hills, NE Minn., once famous for its extensive iron ore deposits. The ores were found in a belt c.110 mi (180 km) long and from 1 to 3 mi (1.6-4.8 km) wide between Babbitt and Grand Rapids, occurring in horizontal layers (up to 500 ft/152 m thick) near the surface and mined by ...
Read more
|
|
|
Mandarin
Mandarin [Port. mandar =to govern, or from Malay mantri =counselor of state], a high official of imperial China. For each of the nine grades there was a different colored button worn on the dress cap. Mandarin Chinese was the language spoken by the official class and was based on the Beijing di...
Read more
|
