Nucleus, that is the answer
Answer:
plate boundaries
Explanation:
Volcanoes and earthquakes are most likely to form along plate boundaries.
Earthquakes:
An earthquake is generated when two plates move relative to each other. The earthquake itself, is the movement felt on the surface caused by the movement of the tectonic plates at their boundaries. There are a few different types of plate boundaries, NOAA does a great job giving a brief description of each here:
http://oceanexplorer.noaa.gov/facts/plate-boundaries.html
When the population is going to increase, the demand of resources like cars, houses, etc is going to increase as well. A lot of trees are going to be cut down to build houses for people. When there’s more transportation materials like cars, the carbon dioxide and greenhouse gases are going to increase as well, causing global warming.
Ecuador & Columbia
Both are Bordering Peru in the North.