Read the text and determine if the sentence is true:

Many compound materials exhibit polymorphism, that is they can exist in different structures called polymorphs. Silicon carbide (SiC) is unique in this regard as more than 250 polymorphs of silicon carbide had been identified by 2006, with some of them having a lattice constant as long as 301.5nm, about one thousand times the usual SiC lattice spacings.

Sentence: Silicon carbide consists of three different elements
It's impossible to say