The dangers that scientists face when they study volcanoes is the danger of being killed by the hot lava if it erupts so they put their life at risk by studying these dangerous natural disaster.
Figure of speech is the answer.
You pick a nice place you think would be nice for a dog park, then you describe how the space looks and some problems you may have for it being there.
Answer:
if you are talking about the nervous/worry pair then the answer is cause and effect.
