Posted by warbaby on June 19, 2021 at 11:07:53 from (24.247.205.221):
In Reply to: Re: 2 inch hail posted by Geo-TH,In on June 19, 2021 at 05:42:50:
The problem of ozone depletion was reduced considerably and the hole is now naturally shrinking due to the actions brought about by the Montreal Protocols of 1987, a worldwide agreement that banned the use of CFC chemicals in propellants and AC systems.
It serves as a good example of a detrimental environmental issue being identified, the source responsible for it being pinpointed, and an international law being enacted to stop it from continuing.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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