18-3 & 18-4 Word Scramble
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Term | Definition |
ice age | Cold time periods in Earth’s history, during which glaciers covered large parts of the surface |
sunspot | Dark, cooler regions on the surface of the sun |
greenhouse gases | Gases in the atmosphere that trap heat; mainly water vapor, carbon dioxide, and methane |
global warming | A gradual increase in the temperature of Earth’s atmosphere |
chlorofluorocarbons | Chlorine compounds formerly used in air conditioners, refrigerators, and spray cans; also called CFCs |
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kjanelli
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