need the Sun's warmth to give them energy_
17. Stone tools began to be replaced around 6,000 years ago by metal tools, who were used to build
instruments and simple machines.
18. One of the most famous structures in the world, the Statue of Liberty is widely considered a
inspiring symbol of hope and freedom.
19. Buses were developed at the beginning of the twentieth century to compete with streetcars by
providing flexibility greater in routes.
20. Abundant rainfall or irrigation is necessary during the early grow period of coffee, but dry
conditions during ripening produce beans with the best flavor.
21. There was at least 2,000 years ago that inhabitants of the Northwest Coast of North America
first established trade mutes for obsidian.
22. The simplest polymers are created when pressure or heat causes small molecules alter slightly
and link together in a long chain.
23. A Canadian Prime Minister must have the supportive of a majority of the members of the House
of Commons to remain in office.
24. The Ashcan school of painting concentrated on ordinary --even ugly--city scenes, rendering
they in straightforward, conventional styles that bordered occasionally on illustration.
25. By. the end of the 1950"s, the suburban population of the United States totaled 60 million,
approximately equivalence to the urban areas of the country.
26. Because it is often dependent of the conditions of crystallization, the composition of the
minerals in a rock can be important in determining the rock's geologic history.
27. Endemic diseases are diseases that habitual infect only those persons living within certain
geographical limits.
28. Regional geography examines, on a regional basis, the ways in which the people local interact
with the environment of the area where they live.
29. The Mobile River and its tributaries, which flow south to the Gulf of Mexico, form most
important river system in Alabama.
30. Beneath the surface of the ocean there lies a hidden world inhabit by plants and animals we
rarely see.
31. Advertising's primary objective is to presell a product, that is, to convince consumers to purchase
an item before they are actually see and inspect it.
32. Fats and fixed oils are greasy or waxy substance that ill their pure state are normally tasteless,
colorless, and odorless.'
33. Of all the elements in the Earth's crust, oxygen is known to be the more common.
34. In microphotography, processes photographic are used to reproduce text or illustrations on
film in sizes requiring magnification for reading or viewing them.
35. The round, hard-shelled nuts of the macadamia tree grow in clusters and are covered with
husks what split when the nuts are ripe.
36. The United States Social Security Act, enacted in 1935, contained three major programs a
retirement fund, unemployment insurance, and welfare grants for local distribute.
37. The light produced by lasers is in general far more monochromatic, powerfully, and coherent
than that from any other light source.
38. Nineteenth-century United States artist John La Farge was the premier interior designer of his
time , receiving commissions for church interiors, private houses, and mural.
39. During first ten years of the Space Age, which began in 1957, more than 500 artificial
satellites were rocketed into orbit around the Earth.
40. Settlers streamed into Connecticut River towns in so large numbers between 1765 and 1790
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