Which of the following statements is true about the Earth?

• The Earth has an atmosphere.

• The Earth has no atmosphere.

• The Earth is made only of water.

• The Earth is surrounded by a solid shell.

What is the approximate percentage of oxygen in the Earth's atmosphere?

• 78.08%

• 0.93%

• 20.95%

• 0.038%

Which of the following gases is NOT a major component of the Earth's atmosphere?

• Nitrogen

• Oxygen

• Argon

• Xenon

If the percentage of nitrogen in the atmosphere is 78.08% and oxygen is 20.95%, what is the combined percentage of these two gases?

• 99.03%

• 98.95%

• 79.03%

• 100%

Which two gases mentioned in the material are present in the atmosphere and are important for weather conditions?

• Water vapor and carbon dioxide

• Nitrogen and oxygen

• Methane and ozone

• Helium and neon

In which layer of the atmosphere is ozone mainly found?

• Troposphere

• Stratosphere

• Mesosphere

• Exosphere

What is the correct order of the atmospheric layers from the Earth's surface upward?

• Troposphere, Stratosphere, Mesosphere, Thermosphere, Exosphere

• Exosphere, Thermosphere, Mesosphere, Stratosphere, Troposphere

• Stratosphere, Troposphere, Mesosphere, Thermosphere, Exosphere

• Troposphere, Mesosphere, Stratosphere, Thermosphere, Exosphere

What happens to temperature as altitude increases in the troposphere?

• Temperature increases

• Temperature stays the same

• Temperature decreases

• Temperature fluctuates randomly

What is a characteristic of the stratosphere, except in its upper region?

• It is very hot throughout.

• It is cold.

• It is filled with water vapor.

• It is the lowest atmospheric layer.

Which layer of the atmosphere is described as the coldest?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere