1. The ponderosa pine is of the most of the timber used by forestproduct firms in the Black Hills of South Dakota.
2. Computers that once took up entire rooms are now to put on desktops and into wristwatches.
3. According to some educators, the goal of teaching is to help students learn what to know to live a well-adjusted and successful life.
4. The sapphire’s transparency to ultraviolet and infrared radiation makes in optical instruments.
5. initial recognition while still quite young.
6. Mango trees, densely covered with glossy leaves and bear small fragrant flowers, grow rapidly and can attain heights of up to 90 feet.
7. the Canadian composer Barbara Pentland wrote four symphonies, three concertos, and an opera, among other works.
8. The Chisos Mountains in Big Bend National park in Texas were created by volcanic eruptions that occurred .
9. In bas-relief sculpture, a design projects very slightly from its background, some coins.
10. Alaska found the first years of its statehood costly because it had to take over the expense of services previously by the federal government.
11. With age, the mineral content of human bones decreases, them more fragile.
12. Not until Kentucky’s Mammoth Cave had been completely explored in 1972 .
13. The first explorer California by land was Jedediah Strong Smith, a trapper who crossed the southwestern deserts of the United States in 1826.
14. Written to be performed on a , Thornton Wilder’s play Our Town depicts life in a small New England community.
15. many copper mines in the state of Arizona, a fact which contributes significantly to the state’s economy.
