a substance that is found naturally in the Earth and that does not contain plant or animal matter. Gold is an example.

COPPER , SILVER, GRAPHITE, WATER , POTASSIUM , LEAD AND ETC

Explanation:

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.