El Nino happens about every two to seven years. The closest answer here would be D., about every three to seven years
The correct answer is - a convergent boundary, where at least one of the plates is oceanic.
Volcanoes can be formed in multiple types of interactions between the tectonic plates, but most often, they form where there's a convergent boundary between a continental and oceanic tectonic plate. This can easily be seen by the famous ''Ring of Fire'', which is on and around the borders of the Pacific Ocean, and that is due to the heavier Pacific plate subducting beneath the lighter continental plates around it, thus creating a very long chain of volcanoes.
Are there any answers to choose from?
The ozone layer and our thick atmosphere keep the earth insulated!! any heat we get from the sun stays on the earth, warming everything up, since the ozone layer acts almost like insulation (or a greenhouse). i hope this helps!!
Population density is the number of people per unit of area. Usually measured by how many people are in a square mile or square kilometer.
