How is ozone formed in the stratosphere?

How is ozone formed in the upper atmosphere? State its importance. What is responsible for its depletion ? Write one harmful effect of ozone depletion.

How many of the following statements are correct ? 1. Good ozone is found in the stratosphere. 2. UV radiation having a lower wavelength than UV -B is almost completely absorbed by the Earth's atmosphere. 3. UV - B causes snow blindness and cataract. 4. dB is a unit to measure the thickness of ozone.

Assertion: Photochemical smog is a combination of photons with smoke and fog. Reason: Photochemical smog is formed in the stratosphere.

Ozone makes the stratosphere

Assertion : An equilibrium is established is istablished between generation and destruction of ozone, leading to a steady state concentration of ozone layer in the stratosphere at an altitude of 20-30 km above sea level. Reason : The thickness of the ozone layer is generally larger above the equator and smaller above the poles.

Oxygen plays a key role in troposphere while ozone in the stratosphere. Elaborate.

Fill in the blanks : Decrese of the concentreation of ozone in the stratosphere is the cause of formation of………. holes.

(a) What depletes ozone in the stratosphere? How does this affect human life? (b) Explain biomagnification of DDT in an aquatic food chain. How does it affect the bird population?

Ozone hole is