123) is one of the combustible components of L. P.G. a) Methane b) Ethane c) Propane d) Butane​

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell

I’ve been stuck on this for a while

How do cracks affect the rate of weathering?