Crystallized intelligence is the ability to use the knowledge that a person acquires over a lifetime. The term is typically referred to in combination with fluid intelligence.
Crystallized intelligence was developed by Raymond Cattell and enhanced by his student, John L. Horn. A person displays this type of intelligence with the use of an extensive vocabulary, learning capabilities, life experiences and an array of skills. As a person ages, crystallized intelligence increases and shows depth.
Fluid intelligence is a logical part of intelligence and is accessed during problem solving and in situations that require some form of reasoning. The two types of intelligences work together, but are considered two different processes.