Fact 1: Heating salt water causes the water to evaporate while the salt remains. Fact 2: Oceans contain salt water. Given the two facts above, what can be heated causing H2O to evaporate and NaCl to remain?

Options are: 1. vinegar 2. Sun 3. heat 4. table salt 5. energy 6. oceans 7. Energy. 8. freshwater
Answer:
6.