Why do new batteries 'become useless after some days?

Why does a rubber band become loose after repeated use?

The type of a battery, in which the reaction occurs only once and then battery becomes dead over a period of time is known as __________.

Why are the bridge declared unsafe after long use?

Why do the wooden doors become very hard to close and open in rainy season.

Why do new iron sheets appear shiny?

Why do insects need moulting?

Why do the veins have valves?

Answer the following questions: Why do new iron sheets appear shiny?

Why do farmers grow leguminous crops after harversting cereal crops?