Science2 Chapter 7 Lesson 1

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Across
  1. 2. Then the water does what to the air in the house?
  2. 4. Something found in nature that people need or use.
  3. 7. What need to be planted to replace the ones that are cut down?
  4. 9. When they are burned, they give off what?
  5. 10. What do people use rocks to build?
  6. 11. What do people use for growing food?
  7. 12. Burning what makes steam?
  8. 13. What are most machines that make electricity powered by?
Down
  1. 1. What do people get many foods and medicines from?
  2. 3. Moving what that collects in dams can also power machines that make electricity?
  3. 5. Wind and moving water can also power machines that make what?
  4. 6. Some people collect sunlight in a solar what?
  5. 8. The heat is used to warm homes and to cook what?