Answer:
I thinks it's B
Explanation:
Because it's what dams do.
It's not D because it caused people to relocate, it's not C because that doesn't make sense.
Answer:
Volcanoes and Earthquakes occur more frequently where tectonic plates meet or separate
Explanation:
Volcanoes do occur underwater at mid - oceanic ridges but it often occurs when the plates are separating and this usually forms new islands
It had smaller population around 2 million