What is the most abundant gas in Earth's atmosphere?
Nitrogen
Oxygen
Carbon dioxide
Argon
What percentage of Earth's atmosphere is oxygen?
Which gas is known as a greenhouse gas in Earth's atmosphere?
Carbon dioxide
Nitrogen
Oxygen
Hydrogen
What is the third most abundant gas in Earth's atmosphere?
Argon
Helium
Carbon dioxide
Hydrogen
Which layer of the atmosphere contains the most ozone?
Stratosphere
Troposphere
Mesosphere
Thermosphere
What percentage of Earth's atmosphere is nitrogen?
Which gas do plants use for photosynthesis?
Carbon dioxide
Nitrogen
Oxygen
Argon
What gas do humans and animals primarily breathe out?
Carbon dioxide
Oxygen
Nitrogen
Argon
Which gas protects Earth from harmful UV radiation?
Ozone
Nitrogen
Carbon dioxide
Argon
What is the main gas responsible for acid rain?
Sulfur dioxide
Nitrogen
Carbon dioxide
Oxygen
Which gas gives the sky its blue color?
Nitrogen
Oxygen
Carbon dioxide
Argon
What gas do plants release during photosynthesis?
Oxygen
Carbon dioxide
Nitrogen
Hydrogen
What is the most abundant noble gas in Earth's atmosphere?
Argon
Helium
Neon
Krypton
Which gas is essential for respiration?
Oxygen
Nitrogen
Carbon dioxide
Argon
What gas makes up less than 1% of Earth's atmosphere?
Argon
Nitrogen
Oxygen
Carbon dioxide
Which gas is used by lightning bugs to glow?
Oxygen
Nitrogen
Carbon dioxide
Hydrogen
What gas is produced during volcanic eruptions?
Sulfur dioxide
Oxygen
Nitrogen
Argon
Which gas is used in carbonated drinks?
Carbon dioxide
Oxygen
Nitrogen
Argon
What gas is commonly used in balloons to make them float?
Helium
Oxygen
Nitrogen
Carbon dioxide
