Melting of ice , corrosion of iron,photo...

Melting of ice , corrosion of iron,photosynthesis in plants, conversion of milk to curd

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Melting of ice
Melting of wax is a physical change while others are chemical changes.

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In corrosion of iron

electrons flow from anode to cathode through the metal while ions flow through the water droplets

an electrochemical cell (galvanic cell ) is formed in which Fe acts as anode and cathode where `O_(2)` is reduced

dissolved `O_(2)` oxidises `Fe^(2)` to `Fe^(3+)` before it is deposited as rust `(Fe_(2)O_(3)."xH"_(2)O)`

all of the above takes place

chemical energy into radiant energy

chemical energy into mechanical energy

solar energy into chemical energy

mechanical energy into solar energy

Depletion of ozone layer

Global warming

Acid rain

eutrophication.