Explain how an intrusive igneous rock could become a metamorphic rock and then an extrusive igneous rock.
*how can an igneous rock become a sedimentary rock?
how does the rock cycle display the law of conservation of mass?
*what determines the size of mineral grains in igneous rocks?
what will determine if a rock becomes an igneous rock or a metamorphic rock?
what is the difference between weathering and erosion?
starred(*) questions are the ones i need with the most.

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?