TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Slimy smear does the bacteria look when seen with the naked eye.

SOLUTION: How does the bacteria look when seen with the naked eye?

PROBLEM: The newest, outer layers of secondary xylem are called sapwood.

SOLUTION: What are the newest, outer layers of secondary xylem called?

PROBLEM: Oldest crust lies deep inside the ocean.

SOLUTION:
Which crust lies deep inside the ocean?