Over the Edge: Exploring the Deep Ocean Floor
Scientists have made great progress in their efforts to map the deepest parts of the ocean. But even with all the new technology that's available, our knowledge and understanding of the deep ocean is far from complete. I..
Over the Edge: Hydrothermal Vents
Hydrothermal vents were discovered in 1977. They are sometimes characterized as deep ocean hot springs found thousands of feet beneath the surface. Hydrothermal vents are of great interest because of their circulation pr..
Over the Edge: Oceanic Ridge System, The
Perhaps the most striking feature that characterizes the deep ocean floor is the vast oceanic ridge system that encircles the Earth along tectonic plate boundaries.
Over the Edge: Submarine Canyons
A submarine canyon is a steep, V-shaped valley that cuts across the edge of the continental shelf and slope. It acts as a funnel, carrying sediment down to the abyssal plain.
Over the Edge: Undersea Volcanic and Tectonic Activity
For large stretches the deep ocean basin is flat. But seamounts, guyots, island arcs and trenches, all of which result at least in part from tectonic activity, break up the sameness.
Over-Consumption
Paul Ehrlich, best known for his work on population growth, cites over-consumption as one of the principle threats to the environment.
Overcoming Communication Problems
In some cases, there are communication problems that arise due to an organizational structure that limits the free exchange of information. Communication problems can also result when employees are subjected to a steady..
Pangaea
Geophysicist and geologist Tanya Atwater talks about the super continent Pangaea, thought to have broken up into the continents as we know them today beginning about 200 million years ago.
Parabola, The
Every parabola has an extreme value, which is the highest or lowest point on the curve, and is symmetrical.
Parents and Children.: Changes in Childcare
In many families today, the job of childcare has been farmed out. While some see this as a source of serious family problems, others contend the impact of outside-the-home childcare has been mostly positive. Still, man..