Electromagnetic waves need no matter to travel - they can travel through empty space (a vacuum). In a vacuum, all electromagnetic waves travel at approximately 3 x 108 m/s - which is the fastest speed possible. ... Light traveling value through an optical Fibre is, 2 x 108 m/s. Hope that helps.
Subduction is the geological process in which one plate moves under another due to gravitational pull. The regions where this process occurs called subduction zones.
A subduction is a tectonic plate which is made up of crust and upper layer of mantle. These two layers are called as lithosphere.
Example: South America, central America and cascade volcanoes. In which the oceanic plate descends beneath a continental plate.
