 यह वीग़ी म Aujourd कर्वनी शrets थे वहने वहने नागनने क्याऻपिनजाः लेईई, दम वहूए � enjoyed , परजा अख़े ख़बियनाने, यह चाल्ती दो कु acha कुढचिष्त्कल कर्मने से, इस और उदो हा �奉थोत्क union , आआठीतGold because the first content was important than that in human system because clearly today then carbon source in aquatic environment, then carbon in calcium carbonates, and carbon in fossil fuels. So students, first of all we are going to talk about the importance of carbon cycle. that if in this ecosystem, the importance of a cyclic wave or a carbon cycle is there. So if we talk about carbon, all the living organisms are made up of biomolecules. All living organisms are made up of biomolecules, carbohydrates, proteins, lipids and the nucleic acid. This is important, there are vitamins for this. All the biomolecules, the backbone of all of them, the main skeleton structure is based on carbon. So it means, as if we look at it, all the importance we have, whether it is carbon or biomolecules are important, then the carbon is also important to make the biomolecule. If the living organisms are made up of biomolecules or can not exist, then the same way, the biomolecules cannot exist without carbon, because their basic structure depends on carbon. So now there are some very important properties of carbon. One is that it is not very reactive. The other is that it is very stable, it has ability to bind with four other atoms. So four is its valency four, because of which it can bind with four other atoms. For example, if we look at hydrogen, hydrogen has the ability to bind with one atom, oxygen has the ability to bind with two, nitrogen can bind with three. So carbon, its valency is the maximum, it binds with four different groups. It means that it keeps the purpose of making a diverse molecule. So carbon cycle, if we look at carbon cycle, any biological cycles, especially biogeochemical cycles, different minerals, materials cycles, usually there is one thing where the main element or material is stored, which we call as reservoir. These things are utilized from reservoir, and ultimately it becomes a part of the reservoir. Similarly, the atmosphere of the reservoir is the reservoir of carbon. And in this reservoir, the carbon is present in the form of carbon dioxide. So carbon is in the form of carbon dioxide in the atmosphere, which is the reservoir of carbon. Similarly, if we talk about, when the organisms come into the body of the animal, or its oxidation of carbon, then again carbon is in the form of carbon dioxide, and it goes back to the environment. In the aquatic environment, the carbon is available in the form of carbon dioxide, because carbon dioxide dissolves in the water. So due to water solubility, like in carbonated drinks, in Pepsi Coke, carbonated is present in the form of carbon dioxide. So this way, means that carbon dioxide has the ability to dissolve into the water. Water is present in the solubile form. So if the aquatic life is present in the algae, then carbon dioxide will dissolve in the form of the available. So when carbon dioxide dissolves in the water, then it reacts with water molecules, and forms the carbonic acid. The reason for its solubility is that it will react with the water, and it will react with the water and carbon dioxide, and form the carbonic acid. Carbonic acid is a weak acid. As soon as carbon dioxide is needed, carbon dioxide will break down, carbonic acid will break down and release the carbonic acid again. So in this way, carbonic acid is a weak acid, which forms the carbonic acid in the water. In the aquatic ecosystem, carbonic acid is available, but if there is some carbon dioxide, it converts into the form of carbonates. These carbonates are normally present in different shells of animals, like molluscs shells, akinodermates endoskeleton, and corals. Corals or coral reefs are basically calcium carbonates. So some amount of carbon is captured in the form of calcium carbonate, in the aquatic bodies. We call it a lock. So, as long as it is present in the form of calcium carbonate, carbon dioxide or carbon dioxide will be locked there. After a long time, when the deposits of calcium carbonate are exposed, when the deposits are exposed, in the sedimentary rock, when the sedimentary rocks are dry, then the calcium carbonate is exposed. When it is exposed, then it will start the weathering of the calcium carbonate again. It will start the breakdown of the calcium carbonate again. When the atmospheric carbonate is released, the lime or marble is released. It is basically the form of calcium carbonate. This is actually the form of calcium carbonate, in the case of calcium and carbon dioxide. There is a relationship between the two. There is a deposit at the end of the form. So, some of the carbon is also deposited in the form of fossil fuels. If we talk about carbon, there is some amount of carbon that is currently in the form of fossil fuels. Now, let's talk about fossil fuels. The fossil fuels that we have are, इस दुरान जितने भी लिवेंग औरग्रिजम ते वो आइसस ता के अटरे के वो बरी होगे जद्तर जो है वो दिपोज़ेट की फाभ में या मरद के अटर के अटर गे बरी होते चलेगे और आन आरवेग कंटिशन्स के लजा से, हाई प्रेश्व के अजा से जो बरीड प्लान्ट सो अनीमल से देवार कनवर्टेर लिएं तो खोल एंद, गेस, अईद के वो फोसल फुल्ट के अंदर फिर क्या होटेगे है, कनवर्ट होटेगे है तो करबन्ट एक साइलिक फाम में ये वापस के अगर ये अंवर्ट के अंदर जार ये अज्शा से ये है दिफ्रन्ट ये निके, ये गो सिस्टम् के अंदर करबन् कहां, कहां, मुझुद है