In the classroom during a visual inspection of a rock, a student recorded four statements about the rock. which statement about the rock is an observation?

1)the rock formed deep in the earth's interior
2)the rock cooled rapidly
3)the rock dates from the precambrian era
4)the rock is black and shiny

here's the link to your question!

explanation:

it is the most commonly accepted one

b) nuclear ive learned that in a pedtrodic table

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.