One important difference between the C, N, and S cycles and the P, Ca, and Si cycles is that
A) P, Ca, and Si are NOT cycled in terrestrial environments.
B) the P, Ca, and Si cycles do NOT involve redox changes or gaseous forms that can alter Earthʹs atmospheric chemistry.
C) the P, Ca, and Si cycles do NOT involve microbial activity.
D) the P, Ca, and Si cycles are NOT affected by global warming or other human activity.

Question

Quizplus · Accepted Answer

The P, Ca, and Si cycles do not involve redox changes or gaseous forms that can alter Earth's atmospheric chemistry, which is a significant difference from the C, N, and S cycles. The latter cycles involve microbial activity and produce gaseous forms like CO2, N2O, and SO2, which can affect Earth's atmosphere and climate. Although human activity can affect all cycles, the impact on the P, Ca, and Si cycles is relatively minor compared to the C, N, and S cycles.

One Important Difference Between the C, N, and S Cycles