3 Complete the definitions with school subjects. 1 ________ is the study of numbers, measurements and shapes. 2 ________ is the study of the way people and countries spend money and make, buy and sell things. 3 ________ is the study of things that happened in the past. 4 ________ is the study of the Earth and everything on it, such as mountains, rivers, land and people. 5 ________ is the study of the life of animals and plants.