Write about an additional terrorist attack. Terrorism is, in its broadest sense, the use of intentional violence to achieve political aims. The term is used in this regard primarily to refer to violence during
peacetime or in the context of war against non-combatants mostly civilians and neutral military
personnel
Examples:
Munich massacre
Birmingham pub bombings
1993 World Trade Center bombing
September 11 attacks
2013 Boston Marathon Bombings

Boston Marathon bombing of 2013, terrorist attack that took place a short distance from the finish line of the Boston Marathon on April 15, 2013. A pair of homemade bombs detonated in the crowd watching the race, killing 3 people and injuring more than 260.

The attacks

The marathon is traditionally held on Patriots’ Day, a public holiday in Massachusetts that commemorates the American Revolutionary War Battles of Lexington and Concord. The festive atmosphere draws hundreds of thousands of spectators to the 26-mile 385-yard (42,195-metre) route from Hopkinton, Massachusetts, to Boston’s Back Bay neighbourhood. More than 26,000 runners participated in the race in 2013, marking the 117th time that the world’s oldest annual marathon had been contested. About five hours into the race, the first bomb exploded less than half a block from the finish line, on the north side of Boylston Street. Roughly 12 seconds later a second bomb exploded some 600 feet (180 metres) from the first. It too was planted on the north side of Boylston Street amid a crowd of onlookers. First responders reacted immediately, and a medical tent that had been erected to treat runners was turned into an emergency medical facility. Three bombing victims died of their injuries, and more than 100 of the seriously injured were transferred to area hospitals as local police and federal investigators surveyed a crime scene that covered 15 square blocks.

Explanation:

chlorofluorocarbons are released via: aerosol sprays and refrigerants.

the answer is c.richard m. nixon