Where does the most tectonic activity occur?

Tectonic activity is the movement of the plates that collectively form the crust of the earth so technically it occurs over the entire face of the earth.
Where this movement affects people is usually at the edges of the plates where they grind against one another, or slip under one another This creates tremendous heat and pressure, which, in turn causes volcanic activity, earthquakes.

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The answer to this question is  c. pharmaceutical accumulation  reclaimed water refers to the water that being used again after it already  used for agricultural purposes.this type of water often contains pharmaceutical accumulation because of the chemical fertilizer that is used for the plants is absorbed into the water.