Which of the following statements is false?
A) Organic chemistry involves the study of compounds which contain carbon.
B) Organic compounds cannot be synthesized in the laboratory.
C) The most common elements found in organic compounds are carbon, hydrogen, nitrogen and oxygen.
D) Organic and inorganic compounds obey the same natural laws.
B
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The major reef builder of the Mesozoic was the ____________________
Fill in the blank(s) with correct word
A gas threatening Earth's ozone layer is
A) sulfur dioxides. B) chlorofluorocarbons. C) the greenhouse effect. D) photochemical smog. E) nitrous oxide.
Surface mining is used to extract what percentage of nonfuel resources in the United States?
A. 10 B. 30 C. 50 D. 70 E. 90
How does failure of an artificial levee differ from failure of a natural levee?
a. The water spills slowly over the levee into its floodplain, dropping coarser particles next to the main channel. b. The water flows faster, and the areas next to the levee are commonly buried under sand and gravel. c. The water flows slowly, depositing valuable topsoil in the floodplain. d. The water flows at the same speed as the river, limiting erosion. e. There is no difference between failure of an artificial and a natural levee.