Elements Max
An example of how chemical elements cycle through an ecosystem?
THANKS, BEST DETAILED ANSWER WILL RECEIVE MAX POINTS.
Carbon is the most obvious, and everyone knows it, because we've actually named the Carbon Cycle.
The short-term cycle runs roughly as below.
(1) ** Carbon moves from the atmosphere to plants. **
Let's begin with free carbon in the atmosphere. In the atmosphere, carbon is attached to oxygen as carbon dioxide (CO2). With the help of the Sun, through the process of photosynthesis, carbon dioxide is pulled from the air to make plant food from carbon.
(2) ** Carbon moves from plants to animals. **
Through food chains, the carbon that is in plants moves to the animals that eat them. Animals that eat other animals get the carbon from their food too.
(3) ** Carbon moves from plants and animals to the ground. **
When plants and animals die, their bodies, wood and leaves decay bringing the carbon into the ground. Some becomes buried miles underground and will become fossil fuels in millions and millions of years.
(4) ** Carbon moves from living things to the atmosphere. **
Each time you exhale, you are releasing carbon dioxide gas (CO2) into the atmosphere. Animals and plants get rid of carbon dioxide gas through a process called respiration.
(5) ** Carbon moves from fossil fuels to the atmosphere when fuels are burned. **
When humans burn fossil fuels to power factories, power plants, cars and trucks, most of the carbon quickly enters the atmosphere as carbon dioxide gas. Each year, 5.5 billion tons of carbon is released by burning fossil fuels.
(6) ** Carbon moves from the atmosphere to the oceans. **
The oceans, and other bodies of water, soak up some carbon from the atmosphere. This is called sequestering. Every year, out of that huge amount of CO2 gas released in process #5 up there, about 3.3 billion tons enters the oceans and lakes as dissolved gas.
** On the LONG time period **
Carbon moves through our planet over longer time scales as well. For example, over millions of years weathering of rocks on land can add carbon to surface water which eventually runs off to the ocean. Over long time scales, carbon is removed from seawater when the shells and bones of marine animals and plankton collect on the sea floor. These shells and bones are made of limestone, which contains carbon. When they are deposited on the sea floor, carbon is stored from the rest of the carbon cycle for some amount of time. The amount of limestone deposited in the ocean depends somewhat on the amount of warm, tropical, shallow oceans on the planet because this is where prolific limestone-producing organisms such as corals live. The carbon can be released back to the atmosphere if the limestone melts or is metamorphosed in a subduction zone.
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