The last pole reversal occurred ________ years ago and, based on magnetic field decay, we are approximately ________ years from entering the next phase
A) 1 million; 200,000
B) 20,0000; 50,000
C) 1,000; 50
D) 790,000; 1,000
D
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Environmental protection has been proven to ________ the number of available jobs because ________.
A. Stabilize; the use of nonrenewable resources is stabilized, and jobs are scarce anyway B. Stabilize; it limits the use of nonrenewable resources (as in the case of the logging industry) C. Decrease; it limits the use of nonrenewable resources (as in the case of the logging industry) D. Decrease; it negatively affects economic growth E. Increase; labor is usually substituted for natural resources (as in the case of recycling)
During the past 70 million years, India has moved south from its original position. Indicate whether the statement is true or false
High-density polyethylene is produced from ethylene by using which of the following?
A) peroxide initiators B) Ziegler-Natta catalysis C) either a or b D) neither a nor b
In the United States lightning strikes are responsible for more than 95% of all wildfires.
Answer the following statement true (T) or false (F)