NO
The Earth is not increasing in size as the Tectonic Plates drift away from each other. A better explanation for this is that when the plate moves from the bottom of the ocean, it creates a portion on the seafloor where the magma fills the gaps, the moving plate collides with another where in the plates colliding with each other will either move up or move downward.
There are a number of active tectonic plates in the Earth's surface, but the most active is the Pacific Ring of Fire. It spans around the continents of North America, South America, Australia and Asia. It surrounds the Pacific Ocean in a horse shoe shape . The countries found near this plate records most numbers of strong earthquakes in the past years. Meaning there are a lot of activities going on beneath the surface.
These are plates that are large in area mostly 20 million square kilometers in size:
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