Question

fossil fuels... of the energy used in the united states. how does... describe the change. because of burning fossil fuels? move...

earth system	change in carbon levels
biosphere
geosphere
hydrosphere

increases
decreases
stays the same/unknown

Explanation:

To solve this, we analyze the impact of burning fossil fuels on each Earth system's carbon levels:

Atmosphere

Burning fossil fuels releases $\ce{CO_2}$ (carbon dioxide) into the air. So, carbon levels increase here.

Biosphere

Higher atmospheric $\ce{CO_2}$ can boost plant growth (more carbon for photosynthesis), but also disrupts ecosystems (e.g., ocean acidification harms marine life). Overall, the net effect on biosphere carbon (stored in plants/animals) is complex, but due to fossil fuel emissions, the biosphere may take up more carbon (increase) or lose it (decrease) in some regions. However, the primary driver of atmospheric increase affects biosphere interactions, and generally, the biosphere’s carbon storage can increase temporarily (e.g., more plant biomass) or decrease (e.g., deforestation + fossil fuels). But for the context of fossil fuel burning, the key is: burning adds $\ce{CO_2}$ to air, and biosphere interacts—often, the biosphere’s carbon levels can increase (e.g., plants take up more $\ce{CO_2}$) or have a complex response, but the most direct link to fossil fuels is atmospheric increase. Wait, no—let's correct:

• Atmosphere: Increases (due to $\ce{CO_2}$ from combustion).
• Biosphere: Plants absorb more $\ce{CO_2}$ (so carbon in biosphere increases as biomass), but if ecosystems are stressed (e.g., ocean acidification kills marine life), biosphere carbon could decrease. However, the dominant short - term effect of fossil fuel burning on biosphere carbon (from plant growth) is an increase (more $\ce{CO_2}$ for photosynthesis, leading to more plant biomass, hence more carbon in biosphere).
• Geosphere: Fossil fuels are stored in the geosphere (e.g., coal, oil, gas). Burning them removes carbon from the geosphere, so carbon levels in the geosphere decrease.
• Hydrosphere: The ocean (part of hydrosphere) absorbs $\ce{CO_2}$ from the atmosphere, forming carbonic acid. This means carbon levels in the hydrosphere increase (as dissolved inorganic carbon).

Filling the Table:

Earth System	Change in Carbon Levels
Biosphere	Increases (or complex, but primary linked to fossil fuels: increase due to plant uptake)
Geosphere	Decreases
Hydrosphere	Increases

of Key Logic:

• Atmosphere: Fossil fuel combustion $

ightarrow$ $\ce{CO_2}$ emission $
ightarrow$ higher atmospheric carbon.

• Biosphere: Elevated atmospheric $\ce{CO_2}$ $

ightarrow$ enhanced photosynthesis (in many plants) $
ightarrow$ more carbon stored in plant biomass (increase).

• Geosphere: Fossil fuels (geospheric carbon) are burned $

ightarrow$ carbon is released (so geospheric carbon decreases).

• Hydrosphere: Atmospheric $\ce{CO_2}$ dissolves in water (oceans, lakes) $

ightarrow$ more carbon in hydrosphere (increase).

If we summarize the changes:

• Atmosphere: Increases
• Biosphere: Increases (or varies, but “increases” is a common response to elevated $\ce{CO_2}$ for plant - dominated biosphere)
• Geosphere: Decreases
• Hydrosphere: Increases

(Note: The biosphere’s response can be more nuanced in the long term or in stressed ecosystems, but for the context of “how does burning fossil fuels affect carbon levels” in each system, these are the primary trends.)

Answer:

of Key Logic:

• Atmosphere: Fossil fuel combustion $

ightarrow$ $\ce{CO_2}$ emission $
ightarrow$ higher atmospheric carbon.

• Biosphere: Elevated atmospheric $\ce{CO_2}$ $

ightarrow$ enhanced photosynthesis (in many plants) $
ightarrow$ more carbon stored in plant biomass (increase).

• Geosphere: Fossil fuels (geospheric carbon) are burned $

ightarrow$ carbon is released (so geospheric carbon decreases).

• Hydrosphere: Atmospheric $\ce{CO_2}$ dissolves in water (oceans, lakes) $

ightarrow$ more carbon in hydrosphere (increase).

If we summarize the changes:

• Atmosphere: Increases
• Biosphere: Increases (or varies, but “increases” is a common response to elevated $\ce{CO_2}$ for plant - dominated biosphere)
• Geosphere: Decreases
• Hydrosphere: Increases

(Note: The biosphere’s response can be more nuanced in the long term or in stressed ecosystems, but for the context of “how does burning fossil fuels affect carbon levels” in each system, these are the primary trends.)