instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
A change of season and less food usually cause certain animals to migrate.
answer:
Which two environmental changes usually cause certain animals to migrate?


question:
Some meteorites are made of iron and nickel and are thought to be very similar to the core of the earth.
answer:
Some meteorites are made of iron and nickel and are thought to be very similar to what part of the earth?


question:
Conductivity, oxidation state and physical appearance are properties that help determine whether elements are metals.
answer:

Conductivity, oxidation state and physical appearance are properties that help determine whether what are metals?