Lightning is
A) when warm and cold air collide.
B) an indication of a high salt content in the air.
C) an indication that the atmosphere is virtually dust free.
D) a discharge of static electricity.
Answer: D
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Current Global Climate Model estimates predict what range of warming for the 21st century?
a. 1o to 2o F b. 1o to 4o F c. 2o to 6o F d. 5o to 10o F
The comparison of the goods and services the same amount of money can actually buy in different countries is an economic measurement of development known as ________.
A. currency exchange rate B. gross national product C. gross domestic product D. purchasing power parity
A heavy cart and a light cart roll down a hill with equal speeds. To stop in the same time the braking force needs to be greater on the
A. heavy cart. B. lighter cart. C. both the same. D. none of the above
Which type of radiation is being emitted in the following incomplete nuclear equation:
Pb ? 
Bi + ??
A. gamma B. beta C. alpha D. A and B E. none of the above