Dear Amy: How big is the world? — Riley, Spartanburg, S.C.
Dear Riley: There are many different ways to judge how big the world is. For example, you could measure in terms of distance. According to Ask an Astronomer for Kids, coolcosmos.ipac.caltech.edu/cosmic_kids/AskKids/
earthsize.shtml, the Earth’s circumference is 24,901 miles, and its diameter is 7,926 miles. You could also determine how big Earth is based on mass or volume. Find out Earth’s mass, volume and other cool stats at NASA’s Earth Fact Sheet, nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html. Another way to look at the size of the world is by population. Currently, the world population is about 7 billion people.
Dear Amy: How is oil found? — Angela, Kuwait City, Kuwait
Dear Angela: Finding oil isn’t an easy task. Geologists look for areas with the right conditions for oil to form and use a variety of methods to determine its presence, such as seismic surveys or a sensitive electronic nose to “smell” hydrocarbons. To learn more about how oil drilling works, check out
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