The 3 Cycles

By Rose Murphy

The Water Cycle

  1. Evaporation- the process by which water is changed into a gaseous state due to an increase in temperature
  2. Condensation- the process by which the water vapor changes to back to a liquid and water droplets collect on a surface when in contact with humid air.
  3. Precipitation- water droplets that fall to the ground as rain, hail, sleet, or snow.
  4. Transpiration- the process by which plants absorb water through the roots and give off water vapor through pores in their leaves.
  • the water cycle is important because all living things need water to live and grow. without it, we'd all be dead.

The Nitrogen Cycle

  1. nitrogen fixation- bacteria converts the nitrogen to ammonia that the plants can use
  2. nitrification- ammonia is converted into nitrate ions that the plants take in as nutrients
  3. ammonification- once the nitrogen has been used up, decomposing bacteria converts the nitrogen - rich waste compounds into simpler ones
  4. denitrification- the other bacteria converts the simple nitrogen compounds back into nitrogen gas, which is then released back into the atmosphere to start the cycle over again
  • the nitrogen cycle is important because nitrogen is a required nutrient for any living organism to produce a number of organic molecules, such as amino acids

The Carbon Cycle

  1. respiration and combustion- carbon enters the atmosphere as carbon dioxide from respiration and combustion
  2. photosynthesis- then, the carbon dioxide is absorbed by the producers to make carbohydrates in photosynthesis. the producers put off oxygen.
  3. animals eat the plants passing the carbon compounds through the food chain. the plants and animals eventually die
  4. the dead organisms are eaten by the decomposers into the ground and the carbon that was in their bodies is released back into the atmosphere as carbon dioxide .
  • the carbon cycle is important because all living organisms are built of carbon compounds and it is an important part of chemical processes