Answer:
The heat they generate
Explanation:
These geothermal vents have been known to release pressures that have been built up over time I'm the form of steam and really hot water. The article from which this question was drawn, goes on to say that the temperature of the ground around areas with the vents can go up to more than 150 degrees fahrenheit. The heat condition of this place was what made Rusty Rodriguez to wonder how plants were still able to survive in the soil.
So the answer is the heat they generate, since these vents generate great heat which normally would have made it difficult for plants to survive.
Hubris, pride, or in other words, his self love
Since this drawing is his way of reminding her that she and their garden are "as safe as a missel thrush", it makes her one of the many creatures whose secrets he keeps faithfully. So, having that in mind, I would say the correct answer is A) his trustworthiness.
The answer is D. Power I posted on your most recent question.