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Nitrogen is the most abundant gas in the atmosphere.
The troposphere contains the majority of the Earth\’s atmospheric water vapor.
Carbon dioxide makes up about 1% of the Earth\’s atmosphere.
Oxygen is the second most abundant gas in the atmosphere.
Argon is more abundant in the atmosphere than carbon dioxide.
The composition of dry, unpolluted air in the troposphere is different around the world.
Methane combustion does not contribute to atmospheric carbon dioxide.
The carbon cycle has been affected by human activities such as burning fossil fuels.
The increase in atmospheric carbon dioxide has no effect on the Earth\’s climate.
The percentage of carbon dioxide in the atmosphere has remained constant for many years.
Deforestation does affect the carbon cycle.
The greenhouse effect is a process that incrases Earth\’s temperature.
Chlorophyll is found in all parts of the plant and is necessary for photosynthesis.