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.
Physical science is basically an umbrella term for the natural sciences that don't deal with living things or systems. We generally contrast physical science with the biological sciences. As we look at the sciences, we see many fields, such as biochemistry, where the biological and the physical sciences overlap.