The process of metal refining is done for the purpose of fixing the metals impurities through the reduction process. On the other hand, problems are encountered in doing this process. Metal refining produces refined metals but the main downside of this process is the production of too much waste after.
Since the wheelbarrow is filled with soil, that adds more weight to it. Which means you would need to use more strength/force.
When the wheelbarrow is empty, it has less weight so you would use less force.
John Dalton's theory:
1) All matter is made of atoms. Atoms are indivisible and indestructible.
2) Compounds are formed by a combination of two or more different kinds of atoms.
