Air and Atmosphere.

(a)   of the air is made up of nitrogen.

For how many kilometres does the atmosphere extent?

• 260

• 310

• 350

• 320

In which layer of the atmosphere does meteorites burn up?

• thermosphere

• Troposphere

• Exosphere

• Mesosphere

What gas is required for the combustion of substances?

(a)  

How much percentage of the atmosphere is made up of oxygen?

(a)  

Who proved air is a mixture?

• Lavoisier.

• Robert Hooke.

• Robert Bilboard.

• Jack parsons.

How much percent of inert gases is present in the atmosphere?

• 0.93

• 0.67

• 0.08

• 0.73

Name the 4th layer of the atmosphere?

(a)  

How much percent of the atmosphere is made up of carbon dioxide?

(a)  

Which of these are greenhouse gases?

• krypton , radon, CO2

• neon , Nitrogen , O

• CO2, Methane , Nitrous oxide,

• xenon, Helium , O