1. Which of the following is NOT a greenhouse gas? A. Oxygen (02) B. Methane (CH4) C. Nitrous oxide (N2O) D. Carbon dioxide (CO2) 4. It is located up in the atmosphere and acts as a greenhouse gas created out of burning gas in cars and factories. A. Ozone (O3) B. Oxygen (O2) C. Water vapor (H2O) D. Carbon dioxide (CO2) 2. What greenhouse gas is considered the largest contributor to the Earth's greenhouse effect? A. Methane (CH4) B. Water vapor (H2O) C. Carbon dioxide (CO2) D. Chlorofluorocarbon (ČFC) 5. Which of the statements below is correct? I. Scientists agree that the increasing greenhouse gases in the atmosphere are caused by human activities. II. Excessive production of greenhouse gases from human actions leads to a climate change. 3. What is greenhouse effect? A. It is the effect of green things around us. B. When you build a house with green paint. C. It is the effect to a person who loves collecting green objects. D. When the gases in our atmosphere trap heat and block it from escaping our planet. A. Statement I B. Statement II C. Both I and II D. Neither I nor II

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