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1. Sun's energy enters Earth's atmosphere

2. Some energy bounces back into space and some stays to keep Earth warm

3. The extra carbon dioxide traps more heat and Earth's temperature

4. More carbon dioxide is added to the atmosphere by human activity

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ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called