Along with the spin of the along with the spin of the earth, what causes its magnetic field? the presence of magnetic rock layers in the lithosphere the partially melted rocks of the asthenosphere the movement of molten rock in the outer core the use of compasses on the surface of the earth

The source of Earth's magnetic field is the molten iron and metals in the earth's core. The spinning of these liquid metals produces the same effect as electric current in a coil which produces a magnetic field.

the presence of magnetic rock layers in the lithosphere

Explanation:

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.