Composition and Structure of Earth's Atmosphere

Which layer of the atmosphere is closest to Earth's surface and where weather occurs?

• Stratosphere

• Thermosphere

• Troposphere

• Mesosphere

What is the primary role of the ozone layer found in the stratosphere?

• To trap heat and keep Earth warm

• To absorb harmful ultraviolet solar radiation

• To produce weather patterns

• To increase atmospheric pressure

How does air pressure change as altitude increases?

• Air pressure increases

• Air pressure remains constant

• Air pressure decreases

• Air pressure fluctuates randomly

Which gas is the most abundant in Earth's atmosphere?

• Oxygen

• Nitrogen

• Carbon dioxide

• Argon

In which layer of the atmosphere do meteors typically burn up?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere