instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Intraplate earthquakes occur because solid lithosphere travels on a round planet.
answer:
What occur because solid lithosphere travels on a round planet?

question:
Together, the muscular and skeletal organs are known as the musculoskeletal system.
answer:
Together, the muscular and skeletal organs are known as what?

question:
A vas deferens is the name of the tube that carries sperm from the epididymis to the urethra.
answer:
What is the name of the tube that carries sperm from the epididymis to the urethra?