Directions: Perform an experiment based on the steps of scientific method. Problem:
Hypothesis:

Materials:
Dirty or dull peso coins
Salt
Vinegar
Small container
Paper towels (tissue)
patulong po kung may sagot napo kayo dto salamat po hanggang mamaya alang po kasi

petroleum? coal maybe?

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).