Multiple choice What are 'rock formers'? Processes involved in rock formation. Natural factors involved in rock formation. Minerals involved in rock formation. Anthropogenic factors involved in rock formation. Reveal answer Fill a bubble to check yourself C Correct answer Explanation Rocks are made up of various minerals. Out of about 2000 different minerals, only 12 minerals are common all over the world. These 12 rock forming minerals are called 'rock formers'.