Perhaps this question is a bit specific, but I'm trying to make a pub quiz right now, where one of the questions I want to ask is what the most common liquid present in earth is, without it being obvious that I'm talking about the liquid core of the Earth.
I was thinking of phrasing the question like this:
What is the most common liquid found in our planet, other than water?
but that already puts too much emphasis on the word "in". If I'd replace it with "on our planet", it'd be technically incorrect, as the earth's core is absolutely not above the Earth's crust.