What percentage of lightning strikes are cloud-to-cloud?

Lightning strikes are : 50% and strike more than 10 miles

Most lightning events are intracloud (IC) or cloud to cloud (CC), occurring high in the atmosphere.

Explanation:

Intracloud lightning is when the lightning strikes are within one cloud. This is actually the most common type of lightning in the world. The lightning is within one single storm cloud. it is also called sheet lightning because of the way it lights up the sky. It can all be obscured from the cloud or only partly obscured. Many times it is confused with ground to ground lightning.

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume