Earth's magnetic field the frequency of earthquakes Earth's tectonic plate activity the composition of the atmosphere
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following has changed over the last 200 years primarily due to human activity?
Possibilities:
- Earth's magnetic field
- the frequency of earthquakes
- Earth's tectonic plate activity
- the composition of the atmosphere

the composition of the atmosphere