Why do CFC's deplete the ozone layer?
What will be an ideal response?
CFCs reach the stratosphere because they are very chemically stable. There the ultraviolet light breaks them apart, releasing the chlorine in them. The chlorine attaches to the oxygen in the ozone molecule, pulling it apart.
You might also like to view...
How many 1 1/4” long pieces can be cut from a 36’ long piece of angle iron? Allow 1/8” waste for each cut.
What will be an ideal response?
?Which of the following is true of globular transfer?
A. ?It is used more commonly in combination with pulsed-spray transfer. B. ?The arc's real work occurs when the current pulses above the transition current. C. ?There are hundreds of drops per second crossing from the wire to the base metal. D. ?The process requires a current level above the transition current.
The shaper is used for production of ____ flat surfaces.
A. horizontal B. vertical C. angular D. both a and b E. all of the above
When moving a material cart on an inclined or declined surface, be sure the _____
A) load does not exceed the labeled weight capacity B) hand brake is within your reach C) hydraulic ram has been removed D) load is cushioned with moving pads to prevent slippage