At the close of the Paleozoic, eastern North America was attached to what is now ________.
A. China and South America
B. India and Antarctica
C. Africa and China
D. Europe and Africa
E. Europe and Asia
Answer: D
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The source of electrons in a common electric circuit is
A. a generator at the power station. B. usually a wall socket. C. a dry cell, wet cell, or battery. D. the electric conductor itself.
Which of the following statements characterizes oxygen 16 and oxygen 18?
A. Oxygen 16 and oxygen 18 evaporate from ocean water at the same rate. B. Oxygen 18 contains two more electrons than oxygen 16. C. Oxygen 16 and oxygen 18 exist in the shells of marine organisms. D. Oxygen 16 and oxygen 18 occur in roughly equal amounts in ocean water.
How are carbon dioxide and other trace gases thought to be potentially related to global warming? Are the levels of these gases in our atmosphere increasing or decreasing and why are levels changing? Finally, what are some of the observed climatic
trends and possible consequences associated with global warming?
Which of the following is true of organic compounds?
A) most are gases, liquids or low melting solids B) they represent only 5% of all known compounds C) both a and b D) neither a nor b