What are some of the factors that contribute to the greenhouse effect and climate change?
What will be an ideal response?
The greenhouse effect or global warming, is the result of the release of increasing amounts of so-called ‘greenhouse gases' into the atmosphere, gases such as CO2, CH4, and manmade gases such as CFC's and HFC's. These greenhouse gases act as a blanket around the earth retaining heat.
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Gas metal arc welding (GMAW) was originally developed as a process for welding _____.? ? Â
A. steel? B. aluminum? C. pipes? D. wire?
Which of the following would be considered a vacuum at sea level?
A. 12 psia B. 14.7 psia C. 10 psig D. 0 psig
Most lumber will exhibit a slight curve on its narrow side that is referred to the _____
a. bow b. crown c. swell d. hump
It is vital that the solar collectors and all exposed piping in a drain-back system be pitched a minimum of ____ toward the storage tank to allow complete drainage.
a. 1/4 in./ft. b. 1/2 in./ft. c. 1/8 in./ft. d. 1/16 in./ft.