The Air around You

The layers of the gases that surround the Earth is the....

• atmosphere
• lithosphere
• hydrosphere
• mesosphere

What are the percentages of the main gases on Earth?

• 78% oxygen, 21% nitrogen and 1% other
• 78% other, 21% oxygen and 1% nitrogen
• 78% nitrogen, 21% oxygen and 1% other
• 95% carbon dioxide and 5% oxygen

Why is it harder to breath at higher altitudes?

• The air is more dense. Heavy air is hard to breath.
• The air is less dense. Less pressure means that the air is thin.
• Less percentage of oxygen at higher levels.
• It is not harder to breath at higher altitudes,

As altitude increases, air pressure....

• increases.
• decreases.
• stays the same.
• deflects due to the Coriolis Effect.

Which layer contains most of the mass of the atmosphere?

• Thermosphere
• Mesosphere
• Stratosphere
• Troposphere

What gas makes up most of our atmosphere?

• Oxygen
• Carbon Dioxide
• Nitrogen
• Methane

At higher altitudes, air pressure is...

• Lower
• Higher
• The same
• Increasing

In which sphere does most weather occur?

• Thermosphere
• Mesosphere
• Stratosphere
• Troposphere

In which sphere do most airplanes fly?

• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere

What force creates air pressure on Earth?

• Gravity
• Magnetism
• Electricity
• Greenhouse Effect