Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Gabbro is a dark dense rock that can be found in the oceanic crust.
Gabbro is a dark dense rock that can be found in what?

Water and humidity is the critical factor for the survival of segmented worms.
What is the critical factor for the survival of segmented worms?

Applying a pressure greater than the osmotic pressure of a solution will cause reverse osmosis.
Applying a pressure greater than the osmotic pressure of a solution will do what?