Quadrilateral. In Euclidean plane geometry, a quadrilateral is a polygon with four sides (or 'edges') and four vertices or corners. Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon (5-sided), hexagon (6-sided) and so on.
Some environmental scientists and specialists focus on environmental regulations that are designed to protect peopleâs health, while others focus on regulations designed to minimize societyâs impact on the ecosystem.
Atmospheric science is the study of the atmosphere, which is the blanket of air covering Earth. Atmospheric scientists, commonly called meteorologists, study the atmosphere's physical characteristics, motions, and processes, and the way these factors affect the rest of our environment.