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Cycles of Life

Explore the fascinating cycles of water, carbon, and nitrogen that sustain life on Earth. Learn how these cycles work, from water evaporating into the air to animals using carbon for energy and plants relying on nitrogen for growth. Understand the importance of maintaining a balance between these essential elements.

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Cycles of Life

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  1. Cycles of Life

  2. Water Cycle The continuous movement of water between Earth’s surface and the air, changing from liquid to gas to liquid.

  3. Evaporation Liquid changes to a gas

  4. Condensation Gas changes to a liquid

  5. Precipitation Any form of water particles- rain, sleet, snow, or hail

  6. Water Vapor Water in its gas state

  7. Watershed An area on which water flows downhill to a common stream, lake, or river

  8. Runoff The water that flows downhill to a common stream, lake, or river

  9. The Carbon Cycle The continuous transfer of carbon between the atmosphere and living things.

  10. How does carbon enter the air? • When plants and animals decay • When animals breathe out • When fossil fuels are burned (car exhaust)

  11. How do plants use carbon? Plants use carbon from carbon dioxide to make sugars, starches, and protein.

  12. What happens to the carbon when living things die? Turned into carbon dioxide by decomposers OR stored as fossil fuels.

  13. How do animals use carbon? Animals use the carbon in sugars, starches, and proteins to make their own body chemicals.

  14. Why do you need nitrogen? To make the parts of your body such as muscles, nerves, skin, bones, blood, and digestive juices.

  15. Air is made up of _____% nitrogen. 78

  16. Animals get nitrogen by eating proteins. Plants get nitrogen by the soil.

  17. Nitrogen Cycle Nitrogen moves between the air, soil, plants, and animals

  18. Name some substances that contain nitrogen. Nitrates and nitrites

  19. Decomposers Organisms that recycle matter from dead organisms

  20. Fertilizers Substances used to add minerals to the soil.

  21. Inexhaustible Resource Will never run out Example: Sun

  22. Exhaustible Resource Can eventually run out Examples: paper, metals, glass

  23. Raw Materials The building blocks of products Examples: Wood, metal, sand, oil

  24. Nonrenewable Resources Can eventually be all used up Can’t reuse Examples: Oil, metals

  25. Renewable Resources Can be replaced within time Examples: Paper

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