topsoil erodes soil nutrients decrease desert conditions appear atmospheric carbon dioxide increases
I gave my students this multiple choice question: Planting certain crop plants in a field causes a disruption of the natural nitrogen cycle in that field. Which outcome would this disruption most DIRECTLY cause in the field over time?

Only one answer is correct among these 4 choices:
- topsoil erodes
- soil nutrients decrease
- desert conditions appear
- atmospheric carbon dioxide increases

Could you tell me which one is correct?

soil nutrients decrease