The strip mining of phosphate on the island of nauru has resulted in a. massive immigration and overcrowding on the island b. environmental and economic problems for the country c. economic success and a high standard of living for many d. financial competition between ethnic groups that has led to civil war

environmental and economic problems

Explanation:

Naru is a small island located in Oceania. Until the beginning of this century, Naru was a territory rich in phosphate, which generated an intense activity of mineral exploration in that island.

However, the exploitation of the island did not take place in a sustainable way. In order to create open-pit phosphate mines, vast wooded areas were destroyed and the climate changed, becoming a typically tropical climate zone with long periods of drought. Today, the island is an arid desert with uneven limestones covering 80% of the entire territory.

answer; (d) one tectonic plate plunges beneath another; (most common,convergent boundaries)