Chapter 13 Earth as a System: Energy, Matter, and Life - Part 5
What geochemical mechanism prevents the runaway accumulation of atmospheric carbon dioxide over geological timescales eq...
Type: MCQ • Marks: 1
What geochemical mechanism prevents the runaway accumulation of atmospheric carbon dioxide over geological timescales equivalent to the carbonate-silicate geochemical cycle?
Options
A. Volcanic outgassing balancing absorption
B. Ocean evaporation and sublimation
C. Photosynthesis in marine algae alone
D. Silicate weathering weathering atmospheric CO₂, forming dissolved bicarbonate which precipitates as oceanic calcium carbonate (CaCO₃) limestone
Explanation
The Urey carbonate-silicate cycle acts as Earth's long-term thermostat, weathering silicate rocks with atmospheric CO₂ and locking carbon away in marine limestone.
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Class 9thScience (MCQ)
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