a. history - study of past events; b. music - study of sounds and rhythms; c. maths - study of numbers and equations; d. economics - study of money and resources; e. physics - study of matter and energy; f. chemistry - study of substances and reactions; g. biology - study of living organisms; h. IT (information technology) - study of computers and technologies; i. geography - study of earth and its features; j. art - study of creative expression.