4.4 Smedes Video Lecture: Exploring Earth's Atmospheric Layers

Which of the following gases is the most abundant in Earth's atmosphere?

• Oxygen

• Nitrogen

• Carbon Dioxide

• Argon

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DOK Level 2: Skill/Concept

What percentage of Earth's atmosphere is composed of oxygen?

• 21%

• 78%

• 0.04%

• 1%

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DOK Level 2: Skill/Concept

Identify the layer of the atmosphere where the temperature increases with altitude.

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

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DOK Level 2: Skill/Concept

Which layer of the atmosphere contains the ozone layer?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

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DOK Level 2: Skill/Concept

In which layer of the atmosphere does weather primarily occur?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

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DOK Level 2: Skill/Concept

What is the primary reason for the temperature increase in the stratosphere?

• Presence of water vapor

• Absorption of ultraviolet radiation by ozone

• High concentration of carbon dioxide

• Reflection of solar radiation

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DOK Level 2: Skill/Concept

Which of the following best describes the composition of the mesosphere?

• It contains the highest concentration of ozone.

• It is composed mainly of nitrogen and oxygen, with decreasing temperature.

• It has a high concentration of water vapor.

• It contains the ionosphere.

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DOK Level 2: Skill/Concept

How does the temperature change in the thermosphere?

• It decreases with altitude.

• It remains constant.

• It increases with altitude.

• It fluctuates randomly.

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DOK Level 2: Skill/Concept

Which gas is present in the smallest amount in Earth's atmosphere?

• Nitrogen

• Oxygen

• Argon

• Carbon Dioxide

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DOK Level 2: Skill/Concept

What is the primary factor that defines the different layers of Earth's atmosphere?

• The presence of different gases

• The change in temperature gradients

• The amount of water vapor

• The concentration of pollutants

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DOK Level 2: Skill/Concept