Describe the process by which the ozone hole promotes its own existence
What will be an ideal response?
The ozone hole is a region where atmospheric circulation and low temperatures conspire to create a circumpolar cloud of ice crystals. These ice crystals promote the ozone-destroying reactions.
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A(n) _________semiconductor is one whose electrical conductivity depends upon the concentration of foreign atoms added to the semiconductor.
Fill in the blank(s) with the appropriate word(s).
Looking through your telescope tonight, you observe a distant galaxy called RXJ1800 and notice that it is very near in the sky to the bright star Vega. What can you conclude from this observation?
A) RXJ1800 and Vega will both set in the west at about the same time. B) Vega orbits the center of mass of RXJ1800. C) Vega and RXJ1800 must be no more than a few light-years apart. D) If you observe them again in a few nights, RXJ1800 and Vega will be farther apart than they appear tonight.
Which of the following types of stars are suitable for advanced life?
A) A-type B) F-type C) O-type D) K-type
If the total energy of an electron in an accelerator is three times its rest energy, what is its speed? (c = 3.00 × 10^8 m/s)
a. 2.00 × 10^8 m/s b. 1.30 × 10^8 m/s c. 1.41 × 10^8 m/s d. 2.98 × 10^8 m/s e. 2.83 × 10^8 m/s