Our series of articles [1-5] named “Physical Processes in the Nature”,
launched from 2014 have the aim to provide concrete help to teachers in integrated
science education. In the series, we gather phenomena and processes that illustrate the
intertwining and fundamentally unified view of physics, biology and geography. The
first article explained the soil physics, the second one the physical and chemical properties
of water, the third the physics of oceans, seas, the fourth the physics of lakes
and the fifth the rivers. In this article, we discuss the characteristics and processes of
deep waters and their explanation.