Explain the difference between mass and weight for objects on earth and on the moon

Mass and weight, while similar are not the same.  Mass is the amount of matter in an object.  This remains the same both on earth and the moon.  Weight is the impact gravity has on an object.  This would be lighter on the moon, and heavier on the earth.

Magma  is composed of molten rock and is  stored  in the earth's crust. lava is  magma  that reaches the surface of our planet through a volcano vent.