The ‘Pacific Ring of Fire’ is a term used to describe a region in the Pacific Ocean characterized by a large number of volcanoes and earthquakes. This region, also known as the Circum-Pacific Belt, stretches from the west coast of North and South America to the eastern coast of Asia and experiences a high level of tectonic activity. Option 1, oil well fires, is not associated with the Pacific Ring of Fire. Option 2, thermal power stations, are not directly related to the geological activity of the region. Option 4, forest fires, are also not directly linked to the Pacific Ring of Fire. Therefore, option 3, volcanoes and earthquakes, is the correct association with the Pacific Ring of Fire.