1. Ecosystems

Biogeochemical Cycles — Quiz

Test your understanding of biogeochemical cycles with 5 practice questions.

Practice Questions

Question 1

Which biogeochemical cycle lacks a significant gaseous phase and primarily cycles through sedimentary rocks and water?

Question 2

Suppose the global lithospheric reservoir of phosphorus is 28,000 Pg and the chemical weathering flux is 0.17 Pg/yr. What is the approximate residence time of phosphorus in the lithosphere?

Question 3

Which human activity has most significantly increased the rate of reactive nitrogen entering terrestrial ecosystems?

Question 4

Which process in the nitrogen cycle converts nitrate (NO_3^–) to molecular nitrogen (N_2), returning nitrogen to the atmosphere?

Question 5

Which reservoir contains the largest volume of Earth's freshwater?