What is the primary difference between the natural greenhouse effect and the enhanced greenhouse effect?
Explanation: The correct answer is C) The role of human activities. The natural greenhouse effect is a process by which certain gases in the Earth's atmosphere trap heat and regulate the planet's temperature. It occurs naturally and is essential for sustaining life. The enhanced greenhouse effect, however, refers to the additional warming effect caused by human activities, primarily the emission of greenhouse gases such as carbon dioxide from burning fossil fuels.
Which of the following is a natural greenhouse gas?
Explanation: The correct answer is D) Water vapor (H2O). Water vapor is the most abundant natural greenhouse gas. It is naturally present in the atmosphere through processes like evaporation, and it plays a crucial role in the natural greenhouse effect by trapping heat and maintaining Earth's temperature. However, its concentration in the atmosphere is influenced by other factors such as temperature and weather patterns.
Which of the following activities contributes to the enhanced greenhouse effect?
Explanation: The correct answer is D) All of the above. The enhanced greenhouse effect is primarily driven by human activities. Burning fossil fuels such as coal, oil, and natural gas releases carbon dioxide (CO2) into the atmosphere. Deforestation reduces the planet's capacity to absorb CO2 through photosynthesis. Industrial processes also contribute to the emissions of other greenhouse gases like methane (CH4) and nitrous oxide (N2O).
What is the main consequence of the enhanced greenhouse effect?
Explanation: The correct answer is C) Sea-level rise. The main consequence of the enhanced greenhouse effect is the warming of the Earth's climate system. This leads to various impacts, including the melting of polar ice caps and glaciers, which in turn contribute to the rise in sea levels. Sea-level rise poses significant risks to coastal communities, ecosystems, and infrastructure.
What is the role of greenhouse gases in the natural greenhouse effect?
Explanation: The correct answer is A) They absorb and re-radiate solar radiation. Greenhouse gases in the atmosphere, such as carbon dioxide (CO2), methane (CH4), and water vapor (H2O), have the ability to absorb and re-radiate infrared radiation emitted by the Earth's surface. This process traps heat and leads to the warming of the lower atmosphere, creating the natural greenhouse effect.