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.
General Environmental Degrees. The two most common degrees in this field are environmental studies and environmental science. An environmental studies degree is an arts degree, looking at the environment from a humanities point of view. Aspiring scientists who are interested in the environment can major in environmental science, explaining environmental processes in terms of biology, geology, chemistry and other science fields.