Over time, pressure and heat change limestone into marble. this change is from:
igneous to metamorphic
metamorphic to igneous
sedimentary to metamorphic
metamorphic to sedimentary

it is the most commonly accepted one

answerspecific gravity;

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.