1. week 3

2. carbon A chemical element found in coal and diamonds and in all plants and animals.

3. nitrogen A colorless, odorless gas that makes up about four- fifths of the earth’s air

4. Carbon dioxide- oxygen cycle The continuous movement of carbon dioxide and oxygen between organisms

5. Nitrogen cycle The continuous movement of nitrogen between organisms and their surroundings

6. fertilizer Nitrogen containing substances used to make soil better for growing plants

7. Carbon dioxide A gas made of carbon and oxygen atoms that plants need for photosynthesis

8. oxygen A colorless gas found in the air. Humans and animals need oxygen to breathe. Oxygen makes up 21 percent of earth’s atmosphere

9. respiration The process of breathing air to get oxygen and breathing out waste gases

10. decompose To rot or decay

11. environment The surroundings that an organism lives in

12. Slide 2: http://focus.aps.org/files/focus/v22/st5/coal_diamond.jpg Slide 3: http://www.dzsc.com/data/uploadfile/20088894856854.jpg Slide 4: http://water.me.vccs.edu/concepts/oxcycle.jpg Slide 5: http://www.nicksnowden.net/images/Nutrient_Cycles/nitrogen_cycle_cartoon.gif Slide 6: http://www.lesco.com/images/roots_flat.jpg Slide 7: http://www.bellabacchante.com/wp-content/uploads/2008/11/co2pollution.jpg Slide 8: http://www.oxyedge-chum.com/images/oxygen_edge.jpg Slide 9: http://www.cartage.org.lb/en/themes/Sciences/LifeScience/GeneralBiology/Physiology/Respi ratorySystem/HumanRespiratory/humrespsys_1.gif Slide 10: http://www.green-support.com/en/img/image024.jpg Slide 11: http://www.efaw.org/images/collage_environment2.jpg