I came across a question asking what's the number of tectonic plates in this illustration:
I don't know on which basis we count the tectonic plates. And I'm confused because I think they are 5 but the answer is 3. As the illustration shows that there are a mid oceanic ridge which is formed because of a divergent plate motion between two oceanic plates and an oceanic trench which is formed due to covergent plate motion between two oceanic plates, so I think that there are three oceanic plates plus two continental plates which are at the two edges of the illustration. Am I right?