Science

Serpentinite Definition Serpentinite is a metamorphic rock consisting almost entirely of minerals in the serpentine group. Serpentinite forms from the alteration of ferromagnesian silicate materials,…

Hypotonia Definition Hypotonia is a common finding with cerebral palsy and other neuromuscular disorders. It is commonly known as floppy baby syndrome, which is a…

Area of a Square A square is a regular polygon with four sides. It has four right angles and parallel sides. To calculate the area…

Motor Cortex Definition Motor cortex is the region of the cerebral cortex influencing movements of the face, neck and trunk, and arm and leg. It…

Locus is a curve or other figure formed by all the points satisfying a particular equation of the relation between coordinates, or by a point,…

Papilledema Definition Papilledema is the swelling of the optic disc caused by increased intracranial pressure. The optic nerve head, also called the optic disk or…

Achávalite is a selenide mineral that is a member of the nickeline group. It has only been found in a single Argentinian mine system, being…

Sphalerite Definition Sphalerite is a usually yellow-brown or brownish-black cubic mineral occurring either as single dodecahedral crystals or as granular masses. It is also called…

Acanthite is a form of silver sulfide with the chemical formula Ag2S. It is one of the most important ores of silver. It crystallizes in…

Corpus Callosum Definition Corpus callosum is the transverse band of nerve fibers that connects the right and left cerebral hemispheres. It is also called callosal…

Evaluating Exponents of Positive and Negative Numbers Exponents can be attached to variables as well as numbers. When they are, the basic rules of exponents…

Dolomite Definition Dolomite is a gray, pink, or white rhombohedral mineral. Dolomite occurs in curved saddlelike crystals with a pearly to glassy luster. It is…