Earth's Atmosphere Layers and Composition

Earth's atmosphere is a mixture of gases, primarily nitrogen and oxygen, that envelops the planet. It consists of five layers: troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Each layer has distinct characteristics, such as temperature and density variations. The troposphere is the densest and is where weather occurs. The stratosphere contains the ozone layer, which absorbs UV radiation. The mesosphere is where meteors burn up. The thermosphere is characterized by high temperatures and includes the ionosphere. The exosphere is the outermost layer, merging with space.

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

• Hydrogen and Helium

• Nitrogen and Oxygen

• Carbon Dioxide and Nitrogen

• Oxygen and Carbon Dioxide

What percentage of Earth's atmosphere is nitrogen?

• 50%

• 79%

• 21%

• 99%

Which layer of the atmosphere is known for weather phenomena like rain and snow?

• Stratosphere

• Exosphere

• Mesosphere

• Troposphere

How does the temperature change as you ascend through the troposphere?

• It decreases

• It remains constant

• It fluctuates

• It increases

What is the primary function of the ozone layer in the stratosphere?

• To produce oxygen

• To trap heat

• To absorb ultraviolet radiation

• To reflect sound waves

In which layer do most meteors burn up upon entering Earth's atmosphere?

• Troposphere

• Thermosphere

• Mesosphere

• Stratosphere

What is the approximate altitude range of the stratosphere?

• 85-600 km

• 50-85 km

• 10-50 km

• 0-10 km

What is the main characteristic of the thermosphere?

• It is the coldest layer

• It is the densest layer

• It contains the ozone layer

• It has very high temperatures

Which gases are primarily found in the exosphere?

• Argon and Neon

• Hydrogen and Helium

• Carbon Dioxide and Methane

• Oxygen and Nitrogen

Which layer of the atmosphere contains the ionosphere?

• Thermosphere

• Mesosphere

• Stratosphere

• Troposphere