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.
What Environmental Scientists and Specialists Do. Environmental scientists and specialists use their knowledge of the natural sciences to protect the environment and human health. They may clean up polluted areas, advise policymakers, or work with industry to reduce waste. Duties. Environmental scientists and specialists typically do the following: 1  Determine data collection methods for research projects, investigations, and surveys. 2  Collect and compile environmental data from samples of air, soil, water, food, and other materials for scientific analysis.
Environmental Sciences is a stand-alone major that draws on fundamental scientific knowledge in mathematics, chemistry, physics, and biology coupled with specialization in a particular area of science to provide advanced scientific and quantitative understanding of contemporary environmental challenges.