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2-5: Carbon Cycle
Carbon Cycle
| Term | Definition |
|---|---|
| biosphere | All the places on Earth where life exists, including land, water, and the air. |
| hydrosphere | All the water on Earth—like oceans, rivers, lakes, and even water underground and in the air. |
| geosphere | The solid parts of Earth, including rocks, soil, and the layers beneath the surface. |
| carbon cycle | The movement of carbon through the Earth’s systems—like the air, water, living things, and the ground. |
| decomposition | The process where dead plants and animals are broken down by bacteria and fungi, returning nutrients to the soil. |
| combustion | The burning of materials (like wood or fossil fuels), which releases carbon dioxide into the air. |
| chemical process | A change where substances are transformed into new substances, like when food is digested or fuel is burned. |
| physical process | A change in the form or appearance of a substance, but not its chemical makeup—like melting ice or breaking a rock. |
| geological process | Natural events that shape the Earth, like earthquakes, volcanoes, and the formation of mountains. |
| biological processes | Activities done by living things, like breathing, growing, eating, and decomposing. |
| Cell respiration | the process cells use to break down food and turn it into energy the body can use. Carbon dioxide is produced as a waste product |
| photosynthesis | The process plants use to make their own food using sunlight, water, and carbon dioxide. It produces sugar for energy and releases oxygen. |
| Fossil fuels | Energy sources like coal, oil, and natural gas that form from the remains of ancient plants and animals over millions of years. |
| methane | A colorless gas that is a powerful greenhouse gas. It comes from sources like cows, wetlands, and natural gas. |
| Carbonic acid | A weak acid formed when carbon dioxide dissolves in water. It is found in things like rainwater and the ocean. |
| Ocean acidification | The process where the ocean becomes more acidic because it absorbs more carbon dioxide from the air, which can harm marine life. |
| Global climate change | Long-term changes in Earth’s temperature and weather patterns, mainly caused by human activities like burning fossil fuels. |
| Nitrogen fixation | The process of changing nitrogen gas from the air into a form plants can use, often done by bacteria in the soil. |
| ammonification | The process where decomposers break down dead organisms and waste, turning nitrogen into ammonia. |
| assimilation | The process where plants take in nitrogen from the soil and use it to build proteins and other important molecules. |
| Acid rain | Rain that has become more acidic because of pollution in the air, especially from burning fossil fuels. |
| Eutrophication | When too many nutrients (like fertilizer) enter water, causing algae to grow quickly and use up oxygen, which can harm fish and other life. |
| fertilizer | A substance added to soil to help plants grow better, often containing nutrients like nitrogen, phosphorus, and potassium. |
| Ecosystem services | The benefits people get from nature, like clean air, clean water, food, and pollination of crops. |
| Agricultural systems | The ways people grow crops and raise animals for food, including the tools, land, and methods used. |
| Deforestation | The clearing or cutting down of forests, often to make land for farming or building. |
| Greenhouse gas | A gas in the atmosphere that traps heat, like carbon dioxide or methane, helping warm the Earth. |