Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
--------
Question: Lead sulfate is the white solid that forms on corroded battery terminals.

Answer: What is the white solid that forms on corroded battery terminals?


Question: Volvox sphere has a distinct front and back end.

Answer: What has a distinct front and back end?


Question: The ocean basin begins where the ocean meets land.

Answer:
The ocean basin begins where the ocean meets what?