A stroke is a brain attack â a sudden interruption of blood flow to part of the brain causing it to stop working and eventually damaging brain cells. The effects can be devastating and may last a lifetime. A stroke is also known as a cerebrovascular accident (CVA). There are several different types of stroke, with different causes. Ischaemic stroke: This is the most common type of stroke, particularly in older people.
Examples of some deep ocean trenches that are subduction zones are off the West coast of South America, in the Peruvian Trench. The Aleutian Trench, in the North Pacific Ocean, and the deepest, most famous one in the world, the Marianas Trench off the coast of the Marianas Islands in the Southeast Pacific.
The ocean trenches are narrow topographic depressions in the sea. These trenches form the deepest points in the ocean and are the lowest points on earth. These trenches are formed at a particular place of plate boundary which is known as subduction zone.It happens to form when a plate in ocean hits another ocean plate or it strikes with continental plate.ow when one plate hits another plate or continental plate in the ocean then the denser plate between the two of them sinks in the mantle. The place where this plate sinks will create a deep trench on that spot of ocean.