General science

General science

A variety of science subjects concerning the fundamental knowledge about different aspects of our world and their underlying principles.

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General science

A relatively large crystal formed in a metamorphic rock. The presence of abundant porphyroblasts gives the rock a porphyroblastic texture. Minerals found commonly as porphyroblasts include biotite, ...

Uropygial gland

Science; General science

A relatively large, compact, bilobed, secretory organ located at the base of the tail (uropygium) of most birds having a keeled sternum. It is known also as the preen, oil, or scent gland. This is ...

Phenocryst

Science; General science

A relatively large crystal embedded in a finer-grained or glassy igneous rock. The presence of phenocrysts gives the rock a porphyritic texture (see illustration ). Phenocrysts are represented most ...

Grylloblattodea

Science; General science

A relatively new order of flightless insects first described from Sulphur Mountain near Banff, Canada, in 1914 by entomologist E. M. Walker. There are now 26 described species of living ...

Planet

Science; General science

A relatively large celestial body moving in orbit around a star, in particular the Sun.

Intron

Science; General science

A segment of deoxyribonucleic acid (DNA) transcribed into ribonucleic acid (RNA) as part of a longer strand of RNA, called heterogeneous nuclear RNA (hnRNA), but that does not survive the processes ...

Oil shale

Science; General science

A sedimentary rock containing solid, combustible organic matter in a mineral matrix. The organic matter, often called kerogen, is largely insoluble in petroleum solvents, but decomposes to yield oil ...