Acid rain

Acid rain is rainfall made so acidic by pollution that it causes environmental harm, mostly to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gets burnt which turns to gas and combines with atmospheric water to form acid. 

Acid rain experiment: Method in a petri dish take a plastic way boat and around it put a small chunk of apple (moist), 3 drops of universal indicator, 3 drops of bromothymol, small flower petal (moist) and calcium carbonate (moist) 

Changes: The apple should go harder than before, the calcium carbonate should go crusty, the flower should go hard, the bromothynol blue should go green, the universal indicator should go red