Q: Fact: break down means change from a whole into pieces
Question: An example of breaking down is

A: cutting an apple into slices

Q: Fact: friction acts to counter the motion of two objects when their surfaces are touching
Question: When wheels are squealing on a blacktop, friction

A: works against motion

Q: Fact: coal mine is a source of coal under the ground
Question: A coal mine is what?

A: a mine that is beneath the earth where coal is found

Q: Fact: oil is a source of energy
Question: Which of the following will help my non-electric lawnmower run?

A:
dinosaur remains