Where do most earthquakes and volcanic eruptions occur on Earth?
The majority occur along boundaries of the dozen or so major plates that more or less float on the surface of Earth. One of the most active plate boundaries where earthquakes and eruptions are frequent, for example, is around the massive Pacific Plate commonly referred to as the Pacific Ring of Fire. It fuels shaking and baking from Japan to Alaska to South America. 44. How hot are the planet’s innards? The temperature of Earth increases about 36 degrees Fahrenheit (20 degrees Celsius) for every kilometer (about 0.62 miles) you go down. Near the center, its thought to be at least 7,000 degrees Fahrenheit (3,870 Celsius). 45. What three countries have the greatest number of historically active volcanoes? The top three countries are Indonesia, Japan, and the United States in descending order of activity. 46. How many people worldwide are at risk from volcanoes? As of the year 2000, USGS scientists estimated that volcanoes posed a tangible risk to at least 500 million people. This is comp
