ago, scientists developed a way to describe every location
on earth using a global address. This method
uses two sets of numbers (called coordinates).
They tell us where to find a location using a grid
system, like the lines on graph paper.
It's like saying, "You can find my house where Maple
Road crosses Elm Street." Instead of streets, the global
address uses numbered horizontal and vertical lines called
latitude and longitude. You describe a location by
giving the numbers of the lines that intersect (for example,
20 latitude north, 90 longitude west).