Chemistry is the scientific study of the properties and behavior of matter. It is a natural science covering the elements that makeup matter to the compounds composed of atoms, molecules, and ions: their composition, structure, properties, behavior, and the changes they undergo during a reaction with other substances.
Food is any substance consumed to provide nutritional support for an organism. A drink (or beverage) is a liquid intended for human consumption.
Geography (from Greek: γεωγραφία, geographia, literally "earth description") is a field of science devoted to the study of the lands, features, inhabitants, and phenomena of the Earth and planets.
Computer science is the study of algorithmic processes, computational machines, and computation itself. As a discipline, computer science spans a range of topics from theoretical studies of algorithms, computation, and information to the practical issues of implementing computational systems in hardware and software.
English as a second or foreign language is the use of English by speakers with different native languages. The term "ESL" has been seen by some to indicate that English would be of subordinate importance; for example, where English is used as a lingua franca in a multilingual country. The term can be a misnomer for some students who have learned several languages before learning English. The terms "English language learners" (ELL) and, more recently, "English learners" (EL) have been used instead, and the students' native languages and cultures are considered important.
Mathematics (from Greek: μάθημα, máthēma, 'knowledge, study, learning') includes the study of such topics as quantity (number theory), structure (algebra), space (geometry), and change (analysis). Mathematics is essential in many fields, including natural science, engineering, medicine, finance, and the social sciences. Applied mathematics has led to entirely new mathematical disciplines, such as statistics and game theory.
Astronomy (from Greek: ἀστρονομία, literally meaning the science that studies the laws of the stars) is a natural science that studies celestial objects and phenomena. It uses mathematics, physics, and chemistry to explain their origin and evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, and comets. Relevant phenomena include supernova explosions, gamma ray bursts, quasars, blazars, pulsars, and cosmic microwave background radiation. More generally, astronomy studies everything that originates beyond Earth's atmosphere.