A common answer to this riddle is "an investment." Investments often appreciate in value slowly over time, but when they decline, they can lose value rapidly. Another interpretation could be "a balloon," which rises gradually but can fall quickly if it pops.
Yes, magma intrusions stays inside the earth. and this goes relatives slowly.
Vaccum leak?
I would say no because of this: Gradually means more slowly and less dramatic. Happily is more like joy and sometimes comes and goes very quickly Hope this helps:)
your age
What goes up when rain comes down is an umbrella.
Heat goes up when rain comes down. This is a kid joke.
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Your age.