Where is the magnet that causes earth’s magnetic field located? what is this magnet made of?

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

The same side of the moon always faces earth because the