Answer: The El Nino Southern Oscillation, a periodic warming and cooling of the surface waters of the central and eastern equatorial Pacific Ocean, is an ongoing cycle of long duration. That is, as far back as weather records go, there is evidence of this seasonal variation.
Explanation:
From small beginnings, South America grew to greatness because of maize. Just did this and it's correct.
Answer: Most of the world's volcanoes are found around the edges of tectonic plates, both on land and in the oceans. On land, volcanoes form when one tectonic plate moves under another. Usually a thin, heavy oceanic plate subducts, or moves under, a thicker continental plate.
Answer: One advantage is that it provides habitats so animals can live and have their shelter. And one disadvantage is that it can be easily damaged by storm waves Areas have to be zoned off from public while it grows Protection is limited to small area.
Explanation: Hope it helps :)