A party's National Convention is e term used in U.S. politics to refer to a meeting of the two major U.S. political parties: the Democratic National and the Republican. In such conventions participate apportioned a number of voting representatives, known as delegates, whose size is determined by factors such as population, the proportion of that state’s Congressional representatives and state officials.
During these conventions it is adopted the statement of party principles and goals, commonly called a platform, setting as well the rules for the party’s electoral activities. However, the most important event that happens at a party's National Convention, which represents their formal purpose, is to select the party’s nominee for President of the United States.
B. Volcanoes usually destroy islands when they erupt.
C. Touching molten lava would not hurt as much as boiling water.
D. Kilauea is the only volcano on the Hawaiian islands
It depends if what you have in exchange is a commodity or product that other party wants and is in need of. If they are satisfied with what they have received during the exchange and you are satisfied with what you received in return then that means that the exchange was beneficial to both parties.