Answer:
Should be number 4, quartz.
Explanation:
Quartz is rougher than calcite, therefore it's able to scratch it.
I believe it is the scientific definition of work, as work = force x distance
Universal indicators are unsuitable for indicators because it has a range of colors.
basically, it changes from pink in alkali to colorless acid.
You have to move higher; potential energy depends on height and mass.
