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 fine grained extrusive igneous rock similar to granite. Rhyolite forms from particularly viscous molten lava and is grey, brown or reddish in colour, darkening w â¦ ith age. Rhyolite is essentially composed of feldspar, mica and quartz with numerous accessory minerals present :).8 people found this useful.hyolite is a type of igneous felsic rock. It is known for its gray  and variable texture that can be glassy, porphyritic, or aphanitic.  It can be a combination of minerals â¦ like plagioclase, sanidine, or  quartz with additional minerals like hornblende or biotite.