Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

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

Matter that mechanical wave energy can only travel through is medium.
What is the name of matter that mechanical wave energy can only travel through?

Diverging lens do you call a lens that causes the light rays to bend away from its axis.
What do you call a lens that causes the light rays to bend away from its axis?