1. The Petrified Forest of eastern Arizona are made up of tree trunks that were buried in mud,sand, or volcanic ash ages ago and have turned to stone .

2. The continental divide refers to an imaginary line in the North American Rockies that divides the waters flowing into the Atlantic Ocean from it flowing into the Pacific.

3. The free silver movement, promoting unlimited silver coinage, gained prominent , in the late 1800’s.

4. Will Rogers was widely recognized for his daily newspaper column, in which he humorously criticized and commented in the politics of his time.

5. First incorporated in 1871, Dallas, Texas, had become the seventh largest cities in the United States by 1976.

6. Although they are in different countries, Windsor, Ontario and Detroit, Michigan are close neighbors and cooperate on numerous matters of mutually interest .

7. At night the desert floor radiates heat back into the atmosphere and the temperature may be drop to near freezing.

8. The design of the University of Virginia came at the end of Thomas Jefferson’s long career as theoretician, statesman, and architecture .

9. Seismology has not reached yet the stage where earthquakes can be foretold with a great deal of accuracy .

10. Duke Ellington was the first person to compose extended jazz works and gives regular jazz concerts.

11. A statue, a monumental , a building, or a park may be dedicated to commemorate a distinguished individual.

12. The wild carrot, knew as Queen Anne’s lace, gave rise to the cultivated carrot in its domesticated form .

13. In 1981 the fossil jaw of a previously unknown small mammal was found onto a Navaho reservation in Arizona.

14. A patent gives inventors exclusive rights to their inventions for a fix period of time .

15. Alike most fruit trees, the quince is normally propagated from shoots or cuttings.

16. In mathematical terms , modern algebra is set of objects with rules for connecting or relating those objects.

17. Watercolors dry more faster than other paints.

18. A footnote is characteristically employed to give information that is too long or too detailed be included in the body of a text.

19. It has not been determined how years sea turtles can live in their natural environment, but they will reach a very old age if left undisturbed by humans.

20. Due to its excellent tensile strength, acetate rayon is an important material for products so as balloons, parachutes, fire hoses, and webbing.

21. Harvesting of grains is affected by annual changes in temperature or in the amount of moisture, but both.

22. Window treatment, furniture arrangement and color combine all contribute to the overall impression of a room .

23. A great proportion of the seeds of desert flora they possess germination-inhibiting substances .

24. Hurricanes are severe cyclones with winds over seventy-five miles an hour who originate over tropical ocean waters.

25. The methods of spectrum analysis vary according to the wavelength region were studied .