Lesson 4: Heat and the Sun

Wrapping Up

Conclusion

Think about the relationship between the Sun and living things. How are living things dependent on the Sun? In what way are most forms of energy related to the Sun? What if the sun cooled down? How would life on Earth change?

Questions to Discuss

  • Can you describe the three laws of thermodynamics in your own words? (Encourage your child to use her own words. The laws are: 1. Energy can't be created or destroyed, but it can be changed. 2. Heat energy always moves from hot things to cold things. 3. You can't have anything colder than absolute zero.)
  • Why is solar power an environmentally friendly form of power? (It is renewable and it produces no pollution. Sunlight can be used to make electricity for heating homes and water, and it can also be used to heat homes and water directly.)

Things to Review

Review the three laws of thermodynamics. Review reasons that people continue to research ways to use the Sun for energy. Review that energy from the Sun is called radiant energy.