Knowledge skills involve intense thought, study, and practice and more often than not are used for discerning one thing from another as opposed to taking a particular action.
Arcana
Anatomy
Appraise
Architecture
Cartography
Chemistry
Constellations
Cosmos
Diagnosing
Direction Sense
Divination
Forgery
Gambling
Genealogy
Heraldry
History
Language
Law
Logic
Math
Music
Nature
Philosophy
Read Lips
Religion
Remember Detail
Research
Ritual
Sailing
Symbology
Teaching
Tracking
Transcribing
Weather Prediction
Wilderness Lore