Science Ch 19

Edit Answers
12345678910
Across
  1. 3. Fuels: Fuels such as gasoline, oil, and coal contain large amounts of carbon.
  2. 6. The atmosphere water vapor cools and becomes liquid again.
  3. 8. Nitrogen: it makes up 78% of the atmosphere but living things cannot use it.
  4. 9. Cycle: The movement of nitrogen from the atmosphere into living organisms then into the earth and then to the atmosphere.
  5. 10. Water in the clouds eventually returns to the earth by falling.
Down
  1. 1. the plant uses energy from the sun to turn carbon dioxide and water into sugar glucose.
  2. 2. Cycle: The movement of carbon from the atmosphere into living organisms then into the earth and then to the atmosphere.
  3. 4. Respiration: process in organisms of breaking down molecules to produce ATP.
  4. 5. Water leaves the earth through evaporation and then enters the atmosphere as a gas called water vapor.
  5. 7. Cycle: The movement of oxygen from the atmosphere into living organisms then into the earth and then to the atmosphere.