Earth's Atmosphere and Air Pressure

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

• Oxygen

• Carbon Dioxide

• Nitrogen

• Water Vapor

Which gas in Earth's atmosphere is essential for photosynthesis?

• Nitrogen

• Oxygen

• Carbon Dioxide

• Argon

What is air pressure?

• The force caused by the movement of clouds

• The force caused by the weight of the air

• The Earth's magnetic field

• The amount of water vapor in the air

What happens to air pressure as you go higher up from Earth's surface?

• It increases

• It decreases

• It stays the same

• It first increases then decreases

Which layer of Earth's atmosphere is closest to the surface and contains most of the air and weather?

• Stratosphere

• Mesosphere

• Troposphere

• Exosphere

What causes meteor showers (shooting stars) to burn and glow in the mesosphere?

• Electrical charges from storms

• Friction and heat generated by hitting gases

• Reflection of sunlight off ice crystals

• Chemical reactions with ozone

Which layer of Earth's atmosphere has the coldest temperatures?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

Where is the majority of Earth's atmospheric gases found?

• In the exosphere

• In the thermosphere and exosphere

• In the first three layers closest to Earth

• Evenly distributed throughout all layers

Which atmospheric layer is known for the occurrence of auroras (Northern and Southern Lights) and where the International Space Station orbits?

• Mesosphere

• Stratosphere

• Thermosphere

• Exosphere

What is the Kármán line?

• The highest point where clouds can form

• The boundary between Earth's atmosphere and outer space

• The altitude where airplanes typically fly

• The layer where the ozone layer is located