TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Ocean ridges formed by marine invertebrates living in warm shallow waters within the photic zone of the ocean are called coral reefs.

SOLUTION: Ocean ridges formed by marine invertebrates living in warm shallow waters within the photic zone of the ocean are called what?

PROBLEM: Pangaea began breaking apart 250 million years ago.

SOLUTION: How many millions of years ago did pangaea begin breaking apart?

PROBLEM: An addition reaction is a reaction in which an atom or molecule is added to an unsaturated molecule, making a single product.

SOLUTION:
What is a reaction in which an atom or molecule is added to an unsaturated molecule, making a single product?