2: Being changed over time so as to be stronger or more complete or more useful.
 7: The chemical element in the Periodic Table having the symbol 'Rn'
 10: The largest object in the solar system.
 11: This river was important in the development of several great civilizations in ancient Mesopotamia.
 17: '__ Wore a Yellow Ribbon': 1949 film
 19: Deposits along the side of a glacier are called ______ moraines.
 22: A group of crickets is known as this.
 26: West, south, ______, and east.