Magnesium is the 8th most abundant element in the Earth's crust and after iron, oxygen and silicon it is the 4th most common element in the Earth as a whole making up 13% of our planet's mass.
The movement of rain and ice inside a thundercloud creates an electrical charge, with the negative charge (electrons) forming at the bottom of the cloud and the positive charge (protons) forming at the top.
An experiment that involves attaching electrodes to a lemon can create a battery that produces electricity. Several lemon batteries can power a small digital watch.
