4 Read this passage from "Alcatraz Island" by the National Park Service. What is the implied main idea?
The US government operates federal prisons to hold people convicted of violating federal laws. Alcatraz housed some of America's most notorious
offenders from 1934 to 1963. They were held under the most secure and regimented conditions, in the virtually escape-proof environment on a rocky
island in the middle of San Francisco Bay. As the highest security prison, Alcatraz kept its inmates under the tightest controls. Inmates were housed
one man to a cell. Two person cells, four-person cells, and open dormitories were common in other federal prisons. Inmates at other prisons spent
most of their days out of their cells at mandatory work programs, educational classes, and recreational activities.
The US government has many federal prisons.
Alcatraz was America's most famous federal prison
Prisoners were kept in isolation at Alcatraz.

it's a secular holiday. it is and was a custom developed to recognize the ending of a time and a wish for a good future. the kind of kiss you exchange, if you are single, is intended to predict what kind of year you will have in the coming year.

it is saying good bye to the last year with all its ups and downs, and hello to the new year, with all its hopes and dreams.

answer: the unlawful use of violence and intimidation, especially against civilians, in the pursuit of political aims.

explanation:

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incident infrared radiation is blocked. visible and ultraviolet radiation heat   earth.

earth radiates infrared radiation. infrared radiation is blocked and heats earth. visible and shortwave radiation heat earth.

earth radiates longwave radiation

longwave radiation is reflected downward longwave radiation heats earth