1) Which of the following best defines the greenhouse effect? a) The process by which certain gases trap heat from the sun in Earth's atmosphere. b) The reflection of sunlight off the Earth's surface. c) The absorption of heat by greenhouse gases in the outer atmosphere. d) The cooling effect of clouds on the Earth's surface. 2) Which of the following are greenhouse gases involved in the greenhouse effect? a) Oxygen b) Nitrogen c) Carbon Dioxide d) Helium 3) Which of the following human activities is a significant contributor to the release of greenhouse gases into the atmosphere? a) Planting trees b) Riding bicycles c) Burning fossil fuels for energy d) Recycling paper

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