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 an igneous rock in the class designated as  felsic  rock. This class of rock crystallizes from silicate minerals at relatively low temperatures and with relatively a high percentage of silica.It is at the low temperature extreme of the Bowen reaction series.hyolite. Rhyolite is an igneous rock in the class designated as  felsic  rock. This class of rock crystallizes from silicate minerals at relatively low temperatures and with relatively a high percentage of silica. It is at the low temperature extreme of the Bowen reaction series.