Answer:
Megathrust earthquakes occur at convergent plate boundaries, where one tectonic plate is forced underneath another. The earthquakes are caused by slip along the thrust fault that forms the contact between the two plates.
The river that forms the border is known as the Paraná River
"B. <span>African culture is extremely diverse; there are over 3,000 different culture groups, and over 800 languages are spoken" since the estimated number of language is actually over 1000. </span>