For most injection wells regulations only address the well structure and site because it is assumed that the natural geological layering makes vertical migration impossible. (dotearth.blogs.nytimes.com)
«The daily vertical migration of zooplankton contributes significantly to the carbon pump by moving fixed carbon from the surface into the deep ocean,» Last explained. (natureworldnews.com)
Tiny crustaceans complete a massive daily vertical migration in the world's oceans. (savethehighseas.org)