How hot are the planets 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 comparable to the entire population of the world at the beginning of the seventeenth century! 47. Which of the following sources stores the greatest volume of fresh water worldwide: lakes, streams or ground water? Groundwater comprises a 30 times greater volume than all freshwater lakes, and more than 3,000 times what’s in the world’s streams and rivers at any given time. Groundwater is housed in natural und
