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.
LINK / CITE ADD TO WORD LIST. noun. Environmental science is defined as a branch of biology focused on the study of the relationships of the natural world and the relationships between organisms and their environments.An example of environmental science is the study of the natural world and how it relates to recycling and mulching.INK / CITE ADD TO WORD LIST. noun. Environmental science is defined as a branch of biology focused on the study of the relationships of the natural world and the relationships between organisms and their environments.