Greenhouse Effect

The greenhouse effect is a natural process that warms the Earth’s surface. It occurs when certain gases in the atmosphere, called greenhouse gases, trap heat from the sun. These gases include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and water vapor. When sunlight reaches the ______ _______ ______ _________ ______ ______ ______ __________ _______ ________ ____ _____.
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