spiral bearing
21reproductive system, plant — Introduction any of the systems, sexual or asexual, by which plants reproduce. In plants, as in animals, the end result of reproduction is the continuation of a given species, and the ability to reproduce is, therefore, rather conservative …
22steel — steellike, adj. /steel/, n. 1. any of various modified forms of iron, artificially produced, having a carbon content less than that of pig iron and more than that of wrought iron, and having qualities of hardness, elasticity, and strength varying …
23Colours, standards and guidons — In the age of line tactics, the unit colour was an important rallying point for the troop. In military organizations, the practice of carrying colours, standards or Guidons, both to act as a rallying point for troops and to mark the location of… …
24Meigle Sculptured Stone Museum — View of the Meigle museum including the backs of Meigle 4 at left and Meigle 2 at right, with one side of Meigle 26 in the foreground.[1] The Meigle Sculptured Stone Museum is a permanent exhibition of 27 carved Pictish stones in the centre of… …
25cosmos — /koz meuhs, mohs/, n., pl. cosmos, cosmoses for 2, 4. 1. the world or universe regarded as an orderly, harmonious system. 2. a complete, orderly, harmonious system. 3. order; harmony. 4. any composite plant of the genus Cosmos, of tropical… …
26Polystrate fossil — [ Nova Scotia, Canada (printed 1868).] Polystrate or upright fossil describes fossils of single organisms (such as tree trunks) that run through more than one geological strata. Entire fossil forests have been discovered [… …
27Chaco Culture National Historical Park — Chaco Culture National Historical Park …
28turbine — /terr bin, buyn/, n. any of various machines having a rotor, usually with vanes or blades, driven by the pressure, momentum, or reactive thrust of a moving fluid, as steam, water, hot gases, or air, either occurring in the form of free jets or as …
29Allosaurus — Eumetazoa Allosaurus Temporal range: Late Jurassic, 155–150 Ma …
30Velvet worm — Taxobox name = Onychophora fossil range = Cambrian – Recent image width = 250px image caption = Velvet worm regnum = Animalia phylum = Onychophora phylum authority = Grube, 1853 subdivision ranks = Extant families subdivision = Peripatidae… …
