The 3 Cycles
By Rose Murphy
The Water Cycle
- Evaporation- the process by which water is changed into a gaseous state due to an increase in temperature
- 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.
- Precipitation- water droplets that fall to the ground as rain, hail, sleet, or snow.
- 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
- nitrogen fixation- bacteria converts the nitrogen to ammonia that the plants can use
- nitrification- ammonia is converted into nitrate ions that the plants take in as nutrients
- ammonification- once the nitrogen has been used up, decomposing bacteria converts the nitrogen - rich waste compounds into simpler ones
- 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
- respiration and combustion- carbon enters the atmosphere as carbon dioxide from respiration and combustion
- photosynthesis- then, the carbon dioxide is absorbed by the producers to make carbohydrates in photosynthesis. the producers put off oxygen.
- animals eat the plants passing the carbon compounds through the food chain. the plants and animals eventually die
- 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