Chemistry-2

How colors are produced in fireworks?
The minerals taken from the earth provide colors, for example - Strontium produces deep red color, copper produces blue color, sodium give yellow color, iron filings and charcoal pieces gives golden color; while bright flashes and loud sounds come from aluminum powder.
[www.livescience.com, 5/17/2008]

Is pure water a better conductor of electricity?
Completely pure water is not a good conductor of electricity, as people think. In practical situations (such as bathtubs, flooded basements) water usually contains many different kinds of impurities (electrolytes) which allow for good electrical conduction.

Which metal is most abundantly available in Earth's crust?
Iron, Copper, Gold, Nickel, Aluminum?
It is Aluminum, by weight of 8.23%.