Which continent has international dealing with natural disasters at this movement?

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.

What is an additional type of erosion found at the coast? what does it mean?

Quais são as consequencias (positivas e negativas) da extração dos minerais metálicos