how does carbon enter the atmosphere?
through volcanic eruptions and combustion of fossil fuels
through photosynthesis and respiration of plants
through decomposition of plants and animals
through excretion of animals
You are correct, carbon enters the atmosphere through several processes, including:
1. Volcanic Eruptions: During volcanic eruptions, large amounts of carbon dioxide (CO2) and other gases are released into the atmosphere.
2. Combustion of Fossil Fuels: When fossil fuels such as coal, oil, and natural gas are burned for energy, carbon stored in these fuels is converted into carbon dioxide and released into the atmosphere.
3. Photosynthesis and Respiration of Plants: Plants take in carbon dioxide from the atmosphere during photosynthesis, converting it into carbon compounds such as sugars and cellulose. Through respiration, plants and all other living organisms release carbon dioxide back into the atmosphere.
4. Decomposition of Plants and Animals: When plants and animals die, their organic matter decomposes, releasing carbon dioxide and other gases as a byproduct. This process occurs naturally and is crucial for the recycling of carbon in ecosystems.
5. Excretion of Animals: Animals, including humans, excrete waste products such as carbon dioxide through various metabolic processes, contributing to the carbon cycle and the presence of carbon in the atmosphere.
Overall, these natural processes and human activities continuously cycle carbon between the atmosphere, living organisms, and Earth's surface.