Geology is the science that deals with the earth's physical structure and substance, its history, and the processes which act on it. Ecology is the study of organisms and their environment. Orology is the study of mountains. Dermatology is the study of skin.

Logic is reasoning conducted or assessed according to strict principles of validity. Ecology is the study of organisms and their environment. Geology is the study of the Earth. Psephology is the study of elections.

Ornithology is the scientific study of birds. Ecology is the study of organisms and their environment. Vexillology is the study of flags. Geology is the study of the Earth's physical structure.

Demography is the study of statistics such as births, deaths, income, or the incidence of disease, which illustrate the changing structure of human populations. Geology is the study of the Earth's physical structure. Psephology is the study of elections. Ecology is the study of organisms and their environment.