horizontal lines of latitude are called parallels
because they run parallel to the equator. Imagine them as
horizontal "hula hoops" around the earth.
latitude line numbers measure how far north or south of the
equator a place is. The equator has the number 0 degrees latitude.
The numbers get larger the further away from the equator up
to 90 degrees. Latitude locations are given as __ degrees
north or __ degrees south.