What is the main element that air is made of?

What percentage of the air is made up of oxygen?

In which layer of the atmosphere does all weather occur?

In which layer of the atmosphere would you find jet planes and the ozone layer?

Which layer of the atmosphere is the most dense?

In which layer of the atmosphere do meteors burn up?

What do scientists use to separate the layers of the atmosphere?

The result of the weight of a column of air pushing down on area is known as...

What instrument is used to measure air pressure?

As altitude increases, air pressure

As air pressure increases, density

Measurements of carbon dioxide in the air taken over the past decade have shown

Atmospheric greenhouse gases help heat the atmosphere by:

Which of the following is one example of a Greenhouse Gas?

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