This site provides a brief overview of the earth’s climate, which is generally defined as the average weather over a long period of time. The climate of a region is determined by both natural and anthropogenic (human-made) factors. The natural elements include the atmosphere, geosphere, hydrosphere, and biosphere, while the human factors can include land and resource uses. Changes in any of these factors can cause local, regional, or even global changes in the climate. This site includes the general distinctions between weather and climate and information designed to help students understand that daily weather measurements are highly variable compared to long-term climate. It serves as a reference for and includes links to four classroom activities.