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.
The Most Popular Environmental Science Careers. Whether it's an environmental scientist or specialist who works in a lab or a natural resource manager who looks after the distribution of the Earth's precious materials, a career in environmental science is for the environmentally-minded individual who wants to make a difference on our planet.