Question

the carbon cycle is a model that describes how carbon moves between earths spheres. the active cycling of carbon sustains life on earth. it regulates climate, supports soil fertility, helps maintain an optimal ocean chemistry, and replenishes essential carbon compounds that organisms need to survive. describe how carbon moves between earths spheres in each scenario. carbon moves from the biosphere to the geosphere. carbon moves from the atmosphere to the hydrosphere. carbon moves from the geosphere to the atmosphere. carbon moves from the hydrosphere to the biosphere. carbon dioxide gas in the air reacts with water to form carbonic acid, which rains down into the ocean. humans extract and burn petroleum, a type of fossil fuel, which releases carbon dioxide gas into the air. carbon - containing substances dissolved in ocean water are used by marine organisms to build their shells and exoskeletons. the shells of dead marine organisms sink to the ocean floor and mix with sediment, forming carbon - rich rock over time.

Explanation:

1. Carbon moves from the biosphere to the geosphere: The shells of dead marine organisms sink to the ocean - floor and mix with sediment, forming carbon - rich rock over time. Marine organisms are part of the biosphere and the resulting rock is part of the geosphere.
2. Carbon moves from the atmosphere to the hydrosphere: Carbon dioxide gas in the air reacts with water to form carbonic acid, which rains down into the ocean. The atmosphere contains the carbon - dioxide gas and the ocean is part of the hydrosphere.
3. Carbon moves from the geosphere to the atmosphere: Humans extract and burn petroleum, a type of fossil fuel, which releases carbon dioxide gas into the air. Petroleum is in the geosphere and the released carbon - dioxide goes into the atmosphere.
4. Carbon moves from the hydrosphere to the biosphere: Carbon - containing substances dissolved in ocean water are used by marine organisms to build their shells and exoskeletons. The ocean water is part of the hydrosphere and marine organisms are part of the biosphere.

Answer:

1. The shells of dead marine organisms sink to the ocean floor and mix with sediment, forming carbon - rich rock over time.
2. Carbon dioxide gas in the air reacts with water to form carbonic acid, which rains down into the ocean.
3. Humans extract and burn petroleum, a type of fossil fuel, which releases carbon dioxide gas into the air.
4. Carbon - containing substances dissolved in ocean water are used by marine organisms to build their shells and exoskeletons.