The ring of fire is a region of tectonic activity. this means that it is an area where are especially common.

the correct answer would be earthquakes because it gives us the answer right in the question by saying "a region where tectonic activity is", and in earthquakes they call the parts of the earthquake where it moves the ground apart tectonic plates.

Hope I helped.

answer they showed that organic molecules such as amino acids could be produced from inoragnic molecules;