Coal.
gas
A seven letter word beginning with C with a the fourth letter C is cracker.
A four letter word beginning with C and ending with X is crux.
carbonate
circuit
Coal is a solid fossil fuel that begins with the letter "c". It is a natural resource formed from the remains of plants and trees that lived millions of years ago. Coal is used for electricity generation and in various industrial processes.
The word beginning with C that is the name for heat flowing through solids is conduction.
creamer
combusting
Chewy
Crush
choice