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 geosphere to the atmosphere.
carbon moves from the atmosphere to the hydrosphere.
carbon moves from the atmosphere to the biosphere.
carbon moves from the biosphere to the geosphere.
carbon dioxide gas in the air dissolves into ocean water, forming carbonic acid, which rapidly breaks down into ions.
carbon dioxide gas in the air is absorbed by plants and used to make carbohydrates.
the remains of dead plants get buried underground. over millions of years, heat and pressure transform them into coal, a type of fossil fuel.
a volcano erupts, releasing volcanic ash and carbon dioxide gas into the air.

Explanation:

1. For "Carbon dioxide gas in the air dissolves into ocean water...": The atmosphere has the carbon dioxide (air), and it moves to the hydrosphere (ocean water), so this matches "Carbon moves from the atmosphere to the hydrosphere".
2. For "Carbon dioxide gas in the air is absorbed by plants...": The atmosphere's carbon dioxide goes to the biosphere (plants), so this matches "Carbon moves from the atmosphere to the biosphere".
3. For "The remains of dead plants get buried underground...": The biosphere (plants) carbon moves to the geosphere (underground, forming coal), so this matches "Carbon moves from the biosphere to the geosphere".
4. For "A volcano erupts, releasing carbon dioxide gas into the air": The geosphere (volcano, part of Earth's crust/geosphere) releases carbon to the atmosphere, so this matches "Carbon moves from the geosphere to the atmosphere".

Answer:

• "Carbon dioxide gas in the air dissolves into ocean water, forming carbonic acid, which rapidly breaks down into ions." → Carbon moves from the atmosphere to the hydrosphere.
• "Carbon dioxide gas in the air is absorbed by plants and used to make carbohydrates." → Carbon moves from the atmosphere to the biosphere.
• "The remains of dead plants get buried underground. Over millions of years, heat and pressure transform them into coal, a type of fossil fuel." → Carbon moves from the biosphere to the geosphere.
• "A volcano erupts, releasing volcanic ash and carbon dioxide gas into the air." → Carbon moves from the geosphere to the atmosphere.