Question

A combined state of carbon.​

Answer 1

Explanation:

Carbon cycle shows the movement of carbon in elemental and combined states on earth. Diamond and graphite are the elemental forms of carbon and in combined state, it is found as carbonates in minerals and as carbon dioxide gas in the atmosphere.

Answer 2

Diamond, graphite and coal are the free forms of carbon. In combined state, carbon occurs in the form of its compounds in solid, liquid and gaseous states. Various physical forms of an element having different physical properties, but similar chemical properties are known as allotropes