Answer:
gas
Explanation:
Because if you mix gas and fire there will be an explosion
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Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.
....Do you mean What can be used to make a black hole? thats easy a black marker and a dark blue marker. :P or blue and black pens
