Why is the national anthem played at sporting events?

24-karat gold is considered to be pure gold. 18-karat gold is considered to be about 75% gold. what is 18-karat gold considered a mixture rather than a pure substance? a) it has a variable composition of other elements and minerals. b) its color is different than pure gold. c) the gold atoms are not arranged in a repeating pattern. d) it can be melted and transformed into a different substance.

The american public was excited by the invention of the railroad system. true false

Using the drop-down menus, choose the correct word or phrase to correctly complete each sentence. the supreme court ruled in favor of the government used by preventing the new york times from printing the documents. the main result of the case was to