Which of the following is produced when electrical discharges pass through oxygen in the air?

How much cooler does the air get for every 1 km increase in altitude in the troposphere?

A. 2 degrees

B. 6.5 degrees

C. 8 degrees

D. 10 degrees

What is the source of lead compounds?

A. aerosol sprays foams

B. exhaust fumes of motor vehicles

C. incomplete burning of wood

D. none of above

The atmosphere is divided into how many layers?

A. two

B. three

C. four

D. five

How much higher can be the temperature inside a greenhouse as compared to the outside?

A. 20 °C higher

B. 10 °C to 15 °C higher

C. 5 °C higher

D. 25 °C higher

The outer layer of the thermosphere is

A. ionosphere

B. exosphere

C. mesosphere

D. stratosphere