E101 - Earth's Atmosphere

Which layer of the atmosphere is characterized by high temperatures and the presence of the ionosphere?

• Thermosphere
• Mesosphere
• Stratosphere
• Troposphere

Why does the sky appear blue during the day?

• The sunlight is scattered by tiny particles in the air
• The sunlight is reflected by the Earth's surface
• The sunlight is absorbed by the Earth's atmosphere
• The sunlight is absorbed by the Earth's surface

What is the main reason for the healing of the ozone layer?

• Increase in volcanic eruptions
• Decrease in volcanic eruptions
• Increase in human activities
• Decrease in human activities

Which layer of the atmosphere contains the ozone layer?

• Thermosphere
• Mesosphere
• Stratosphere
• Troposphere

What is the main reason for the thinning of the ozone layer?

• Carbon dioxide
• Methane
• Greenhouse Gases
• CFCs

What is the importance of the ozone layer in maintaining a habitable environment on Earth?

• It absorbs carbon dioxide from the atmosphere
• It regulates the temperature of the Earth
• It protects the Earth from harmful radiation
• It produces oxygen for living organisms

What is the role of the ozone layer in protecting Earth from harmful UV radiation?

• It absorbs and traps UV radiation in the atmosphere
• It absorbs and deflects CFCs back into space
• It absorbs and deflects UV radiation back into space
• It absorbs and releases UV radiation into the atmosphere

What is the main reason for the increase in oxygen levels in the Earth's atmosphere?

• Photosynthesis by early organisms
• Volcanic eruptions
• Human activities
• Meteors

Which layer of the atmosphere is the middle layer where meteors burn up upon entry?

• Stratosphere
• Thermosphere
• Mesosphere
• Troposphere

What is the main reason why the sky appears red at night?

• The sunlight has to pass through more of the Earth's atmosphere
• The sunlight is reflected by the Earth's surface
• The sunlight is absorbed by the Earth's atmosphere
• The sunlight is more directly overhead