Which of the following is called protective layer?

Compose a dialogue between two friends about the causes and effects of the second world war. 1

Prepare a story including to causes and effects of the first world war. 1

How does seismograph measure the magnitude of the earthquake. 1

Present the differences between epicenter and hypocenter. 1

Though earthquake can not be prevented, its damages can be minimized: 1

What is the rate of decrease of temperature per kilometer as we go up in troposphere. 1

Things to be considered before, during, after earthquake.  1

What is the full form of CFC. 1

CFCs deplete ozone layer choose the other gases that deplete ozone layer. 1

What do you mean by earthquake? Can it be prevented ? Write your opinion. 1