Which sentence from the article supports the devastation from pyroclastic flows and surges? a. "on that night an explosive eruption tore through the summit and spewed approximately 20 million cubic meters of hot ash and rocks across the snow-covered glacier." b. "these materials were transported across the snow pack by avalanches of hot volcanic debris (pyroclastic flows) and fast-moving, hot, turbulent clouds of gas and ash ( pyroclastic surges)." c. "as these floods of water descended the volcano, they picked up loose debris and soil from the canyon floors and walls, growing both in volume and density, to form hot lahars." d. "in a few short minutes most of the town was swept away or buried in a torrent of mud and boulders, and three quarters of the townspeople perished."

The sentence from the article that supports the devastation from pyroclastic flows and surges is "these materials were transported across the snow pack by avalanches of hot volcanic debris (pyroclastic flows) and fast-moving, hot, turbulent clouds of gas and ash ( pyroclastic surges)."

Explanation:

This sentence from the article talks about the devastation that comes out of pyroclastic flows and surges as it describes how this phenomenon happens, besides it has strong words that talk about an invasive and aggressive attack such as avalanches, hot volcanic, fast-moving, turbulent clouds, they represent hostility.

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the speech this question is referring to is president kennedy's special message to the congress on urgent national needs, may 25, 1961

kennedy responds in a very direct and concrete way to those thinking that communism is a positive system:

"yet their aggression is more often concealed than open. they have fired no missiles; and their troops are seldom seen. they send arms, agitators, aid, technicians and propaganda to every troubled area. but where fighting is required, it is usually done by others--by guerrillas striking at night, by assassins striking alone--assassins who have taken the lives of four thousand civil officers in the last twelve months in vietnam alone--by subversives and saboteurs and insurrectionists, who in some cases control whole areas inside of independent nations." (kennedy)

president kennedy presents communism as cowardly, as a hidden and treacherous weapon that strikes from the shadows like thieves, he represents the system as not even being capable of showing and open and overt attack or confrontation. to finish up the response, he expresses that the system attacks even a country's idependence and freedom.