Understanding Air and Earth's Atmosphere

What is air primarily composed of?

• A mixture of gases

• Only oxygen

• Only nitrogen

• A single type of gas

Why is air crucial for plants?

• It keeps them anchored to the ground

• It contains gases necessary for growth and oxygen production

• It helps them absorb sunlight

• It provides them with water

What role does gravity play in relation to Earth's atmosphere?

• It has no effect on the atmosphere

• It only affects the oceans

• It pushes the atmosphere away from Earth

• It holds the atmosphere in place

Which layer of the atmosphere is closest to Earth's surface?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

Why might it be more difficult to breathe on a high mountain?

• The air is too hot

• The air is too cold

• The air is less dense

• The air is more polluted