Science Struck
Science Struck: What Are Ocean Trenches and How Are They Formed?
Around 72 percent of the Earth's surface is found under the oceans. It has always been contributing to the dynamically changing face of the Earth through the tectonic phenomenon occurring at its depths. Such a naturally occurring...
Wikimedia
Wikipedia: Pacific Ring of Fire
Wikipedia offers information on the location of the Pacific Ring of Fire, an area of frequent earthquakes and volcanic eruptions. Map included.
Wikimedia
Wikipedia: Oceanic Trench
Wikipedia provides brief information on oceanic trenches, and has a hyperlinked list of major world trenches.