Chemistry
The presence of ozone in the stratosphere is responsible for

Increasing the average global temperature in recent years
Checking the penetration of ultra-violet rays to the earth
Higher rate of photosynthesis
Supplying oxygen for people travelling in jets

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Chemistry
Metal are good conductors, because

The molecules in them are very close to each other
They contain free electrons
They contain reflecting surface
The molecules in them collide very freely

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