Jet stream and cold front of course
A valid statement concerning the Catholic Church during the Middle Ages is that it became very rich and powerful during that time. People would give church 1/10th of their earnings in tithes. The Church also received money in the form of payment for various sacraments such as baptism, marriage, and communion. Also, the Church was a powerful force in medieval life, dominating everyday life for the majority of people. It could also confirmed kings on their throne giving them the divine right to rule.
Operant conditioning is reinforcement, classical conditioning relies more on association between stimuli and responses. A second distinction is that much of operant conditioning is based on voluntary behavior, while classical conditioning often involves involuntary reflexive behavior.