Noun. 1. continental divide-the watershed of a continent (especially the watershed of North America formed by a series of mountain ridges extending from Alaska to Mexico). water parting, watershed, divide-a ridge of land that separates two adjacent river systems.. a divide separating river systems that flow to opposite sides of a continent. 2. (caps. ) Also called Great Divide. the watershed in North America formed by the Rocky Mountains, separating streams flowing west from those flowing east.
life science. Any of several branches of science, such as biology, medicine, or ecology, that studies living organisms and their organization, life processes, and relationships to each other and their environment.. Any of several branches of science, such as microbiology, zoology, botany, or ecology, that deal with living organisms and their organization, life processes, and relationships to each other and their environment. Also called bioscience.
Earth science. Earth science or geoscience is a widely embraced term for the fields of science related to the planet Earth. It is the branch of science dealing with the physical constitution of the earth and its atmosphere. Earth science is the study of our planetâs physical characteristics, from earthquakes to raindrops, and floods to fossils. Earth science can be considered to be a branch of planetary science, but with a much older history. âEarth scienceâ is a broad term that encompasses four main ...