Define vertebrate: any of a subphylum (Vertebrata) of chordates that comprises animals (such as mammals, birds, reptiles, â¦ â vertebrate in a sentence any of a subphylum (Vertebrata) of chordates that comprises animals (such as mammals, birds, reptiles, amphibians, and fishes) typically having aâ¦ See the full definition
Definition of LIGNITE. : a usually brownish black coal intermediate between peat and bituminous coal; especially: one in which the texture of the original wood is distinct âcalled also brown coal.
Rhyolite is a high-silica lava that is chemically the same as granite but is extrusive rather than plutonic.(more below).he presence of phenocrysts means that rhyolite has a porphyritic texture. This rhyolite specimen, from the Sutter Buttes of northern California, has visible phenocrysts of quartz.