The water cycle, is the adventure that water takes in a circle from land, to the sky, and back down again. It starts with the sun and its heat which provides energy to start the cycle and evaporation. Evaporation is the process when water is changed into either vapor or steam. After it evaporates, it starts to condensate which means it turns from a gas back into a liquid. When condensation is finished, it builds up in clouds until its to heavy and it starts to fall which creates precipitation or makes it rain. When it rains, it starts to runoff from things such as rocks and mountains. After that, it goes into the ground and through the plants and sits on the leaves which starts transpiration hence the cycle starting over.
Humans have a major impact on the water cycle. For example, when it starts to rain or when it is raining we put systems in the ground for the rain so it won't overflow parking lots and other places that collect water rapidly.
THe Carbon Cycle
In the carbon cycle, there are two main processes known as Photosynthesis and Metabolism. When the cycle starts, carbon enters the atmosphere from respiration. Next, it's absorbed by organisms (Producers) in a process called photosynthesis. During photosynthesis, plants use carbon dioxide and turn it into oxygen. After this, animals come and eat the plants which transfers the carbon throughout. Next, the carbon can be released as respiration or through the dead animal. The dead animals are eaten by decomposers and then the carbon is released back and the cycle starts again.
There are two main human interventions in the carbon cycle. One is burning fossil fuels and the other is land use or land cover change. Burning fossil fuels releases carbon into the atmosphere. Land us or cover change can affect the cycle, because it takes away big portions of carbon from the earth.
In photosynthesis, the plants take inorganic compounds such as carbon and water and turn it into carbs. The carbon cycle also has organic compounds such as hydrocarbons (coal, and natural gas).
The Nitrogen Cycle
The Nitrogen Cycle has 5 major steps: nitrogen fixation, nitrification, and denitrification. During nitrogen fixation, bacteria converts the gas into forms which is used by plants. After nitrogen fixation, comes nitrification. During nitrification, Ammonia is converted into nitrite or nitrate which starts the next step, assimilation. Assimilation is just a way for the plants' roots to absorb new form of nitrogen. After this, comes ammonification. Ammonification, converts organic nitrogen to ammonia by the bacteria in decomposition. Lastly is denitrification. Denitrification, ties the whole cycle together. It turns the decomposed matter back to nitrogen which starts the whole cycle back over.
Humans play a part in the nitrogen cycle by burning fuels which release nitrogen into the atmosphere. Also, by destroying forest, grasslands, and wetlands which release mass quantities into the air.
In the Nitrogen Cycle, fungi and bacteria break down organic nitrogen compounds in dead remains and decay. An inorganic compound in the cycle is Ammonia. This is created when organic compounds are converted.
The first step in the phosphorus cycle starts in sedimentary rock which has to be released through erosion for it to be used. Then it is released into soil and water which is then taken up by plants. After this the plants get eaten by the animals which give them phosphorus. Towards the end of the cycle phosphates return to the earth when organic materials are decomposed.
Plants take phosphorus and converts inorganic compounds into organic compounds. Inorganic phosphorus compounds have to be soluble to be taken up by the plants. The organic phosphorus after being taken through the whole cycle, converts back into organic phosphorus through decomposition.
Humans take part in the phosphorus cycle by using fertilizers and raising livestock. Livestock waste and fertilizers have a lot of phosphorus which can be transferred into the ground.