What is the primary cause of the increase in carbon dioxide levels in the atmosphere?

• Burning fossil fuels

• Deforestation

• Volcanic eruptions

• Industrial waste

Which of the following gases is NOT a greenhouse gas?

• Oxygen

• Carbon dioxide

• Methane

• Nitrous oxide

Where are most of the gases in Earth's atmosphere located?

• Troposphere

• Stratosphere

• Mesosphere

• Exosphere

What role do greenhouse gases play in Earth's atmosphere?

• They absorb radiant energy from the Sun, helping to maintain Earth's temperature.

• They block sunlight, causing global cooling.

• They are responsible for the ozone layer depletion.

• They cause acid rain.

What natural systems help balance carbon dioxide levels in the atmosphere?

• Oceans and rainforests

• Deserts and mountains

• Rivers and lakes

• Glaciers and ice caps

What has the Mauna Loa Observatory in Hawaii been measuring since 1958?

• Carbon dioxide levels in the atmosphere

• Global temperature changes

• Sea level rise

• Ozone layer thickness

What is a consequence of excess carbon dioxide dissolving in oceans?

• Ocean acidification

• Increased fish population

• Decreased ocean salinity

• Formation of coral reefs