Encyclopedia Britannica Online, featuring the complete Encyclopedia Britannica, and the Britannica Concise Encyclopedia.
Physics (Greek: physis meaning "nature") is a natural science that involves the study of matter, its motion through spacetime, and all allied components, such as energy and force. This has led to the discovery and understanding of the laws ...
Weather is an all-encompassing term used to describe all of the many and varied phenomena that occur in the atmosphere of a planet at a given time. The term usually refers to the activity of these phenomena over short periods of hours or days, as ...