Exploring Earth's Atmosphere

What are the main gases that make up the Earth's atmosphere?

• Helium (15%)

• Methane (5%)

• Nitrogen (78%), Oxygen (21%), Argon, Carbon Dioxide, and Water Vapor (1%)

• Hydrogen (75%)

What percentage of the atmosphere is nitrogen?

• 85%

• 90%

• 72%

• 78%

Which gas is essential for human respiration?

• Carbon Dioxide

• Hydrogen

• Nitrogen

• Oxygen

What layer of the atmosphere is closest to the Earth's surface?

• Mesosphere

• Stratosphere

• Thermosphere

• Troposphere

What is the name of the layer where weather occurs?

• Stratosphere

• Mesosphere

• Troposphere

• Thermosphere

Which layer of the atmosphere contains the ozone layer?

• Stratosphere

• Thermosphere

• Troposphere

• Mesosphere

What is the highest layer of the Earth's atmosphere?

• Exosphere

• Stratosphere

• Troposphere

• Mesosphere

What is the primary function of the atmosphere?

• To provide oxygen for combustion.

• To create weather patterns only.

• To block all harmful radiation completely.

• To protect life on Earth and regulate climate.

How does the composition of the atmosphere change with altitude?

• The concentration of oxygen and nitrogen decreases, while ozone levels increase in the stratosphere.

• Nitrogen levels remain constant throughout the atmosphere.

• The concentration of carbon dioxide increases with altitude.

• Ozone levels decrease in the troposphere.

What is the role of carbon dioxide in the atmosphere?

• Carbon dioxide helps regulate Earth's temperature and is vital for photosynthesis.

• Carbon dioxide is a waste product that has no impact on climate.

• Carbon dioxide contributes to the depletion of the ozone layer.

• Carbon dioxide is a primary source of oxygen in the atmosphere.