Why do we rub magnesium ribbon with sandpaper?

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.

What methods could you use to solubilize calcium carbonate